I was. It very traumatic for me.

I had panic attacks, nightmares every night, I would even cry in my sleep.
I was fearful of leaving home, of driving. I would walk the dog, but otherwise I was too scared to leave the house. It was horrible. I was a real basket case!

Things do get better. Although I do wonder what would have become of me if my H chose the slut over me. . . .

Sounds pretty similar to how I am. It’s almost embarrassing at how much this has consumed my life.

Agreed, it doesn't comp[are to the unimaginable of battle, however it can shatter what you believed
it knocked me hard, married 24 years, I thought she was the best thing that ever happened to me and was happening to me
poof
what i thought was real
was not
how many years of false memories implanted by her to feed the deciet

yes it's close enough to PTSD

I was pretty much the same as what Storm describes. Diagnosed with C-PTSD after husband's cheating and have never seen a day of combat in my life. It really does happen to some of us.

I think most of us go though some kind of PTSD after D day and PTSD isn t just for certain people it can hit anyone that has been through a traumatic event and yes finding out about an A can be very traumatic for someone, it was for me, I suffer from GAD and panic attacks and after D day it made my symptoms worse I would panic and my anxiety would last for days the crying spells too....i can remember having a good day my H came home and was gonna take me out for dinner and as soon as we left my anxiety came on and as we pulled up to the restaurant I just busted out crying I wasn't comfortable being around people at the time it was a pure roller coaster ride for almost a year after D day I never knew how I was gonna react in certain situations I just had to start figuring out how to deal with everything because it had started consuming me as well I hate feeling out of control of things and I don't handle change very well but talking with my counlser helped with that and at least help me with the fact I can't control everything that happens I just had to figure out how to deal with things when they did happen

Yes, overcome with the blues several times a day. Feel like crying even when having a decent time with the cheating BF. Anxious. Wake up early in the morning with the same thoughts going over and over. But the PTSD symptom I notice the most is I am hypervigilant when I see a car that matches that of the other woman, a red convertible. It just makes my heart race, and most of the time, it is not her. What can I do to make this reaction stop?

I think it affects people to different degrees depending on their base level of emotional strength.

However, it is highly traumatic in every case and the effects are intense and will likely last a lifetime to a much lesser degree hopefully.

Certainly it can cause PTSD like symptoms as many require medications to reduce their anxiety and suicide/homicide are unfortunately consequences for the most unstable few.

I was "diagnosed" with PTSD however it was not a full clinical evaluation - it was more of an appropriate comparison my therapist used to help me understand why my body and mind were reacting like they were. I too did not like the idea because this seems reserved for the truly impacted in battle etc. however I can say now several years later that this was exactly what it was and it took therapy to fight the ghosts and demons.
Anxiety, panic attacks, new "issues" - I could not drive on a highway for almost a year (weird huh) because i would get overwhelmed with fear, sleep problems, severe triggering etc.
The important thing is that we get the help we need no matter the label.

Sounds like what I am going through too. I don't sleep. Have trouble eating (lost over 25lbs) since this has all began. I have Anxiety attacks all of the time. Sometimes I just sit home alone at night crying. I see a therapist once a week sometimes I leave there feeling great other times I don't. And to top it all off they think that I have a heart condition and I need to see a Heart doctor. The time that I need my spouse I don't have him because is with the Home wrecker.

It's actually quite common. It's called betrayal trauma and most general therapists are trained to treat it.

Anyone can have PTSD after any event that is traumatic to them.
Therapy can help you nevigate the process.

Like @Refurb my wife of 20 years cheated and eventually left me.
I had no idea she cheated but attacked me for a year before walking out...and continued for another year
She abused me so much , I have suffered with PTSD for 5 years since she left.

Getting much better and many symptoms have diminished.....but still there ...triggered throughout the day and night

Totally valid. I am diagnosed with ptsd from work (police/military) then I find out about the affair. Everything gets that much worse. All the symptoms sound the same and this is something traumatic and sudden to go through. Unlike my 13 yr career where I built up trauma, my 13 yr old marriage slowly dissolved (in hindsight) but seemed to fall apart over night. The shock feels the same.