Panic Attack is Back

I have been doing so well.  A little upset now and then, but this morning my heart is pounding and I am all upset.
Wish I understood why.  I know I am feeling like I don't belong again and no one likes me.  Know I am being stupid.
My sweet little daughter in law spent most of the weekend with me.  I shouldn't feel that way, but my oldest son was gone all weekend with his fiancé who is supposedly living with us.  I have seen way less of them since she moved in.  Weird I know, but it is like she is avoiding us.  She comes out on her way to work then schedules herself off somewhere every night.  They were spending at least two nights a week with us when they were fighting with her parents.  Last week it was none and then gone all weekend, although the weekend was scheduled long ago.
My friend wanted to study with me last week.  Cancelled out on Wed and then no showed on Friday.  She said we didn't set a time.  Um agreed on after work at my house.  She said she'd love to study this week just to let her know when.  So said Wed would work, but she never answered.
Of course church yesterday didn't help as felt so out of place I left.
The class I am teaching 4 out of 7 have quit.  Wondering if I am a terrible teacher.  I know I haven't been giving it my best this year.   Too many outside distractions.   I know one had tech problems and couldn't complete the online stuff, one is a truck driver so gone a lot, one went on vacation and when he came back said he was just too far behind and the last told me she got a promotion at work and has mandatory training.  Could also be the work load as the class has crazy levels of homework, or the fact that the last payment date is this week.  But taking it personally.
Worst part is I actually have an hour to myself this morning.  Haven't had time alone in forever and what am I doing...freaking out over nothing.