how am i going to deal with the stress and hopelessness

I am so frustrated and depressed, there are so many things going on and we just keep getting dealt one blow after another.  I still miss my Dad and Mom terribly, the thoughts of my Dad lately and the emptiness I feel in my life is horrible. 
My husband hit his head at work on dec. 20th of last year, so on top of our allready extensive marital problems (he is a porn addict) I have since then had to deal with a husband who is  off work with a head and back injury, but the head injury got approved then kicked back by the bwc.  so of course now we have an attorney, he is seeing a neuro psychologist, a very good one, tomorrow.  since i have to work I have to email her all the information that has changed in his life since he struck his head....because of the head injury he won't remember.  He is due to go back to work on wed. now.  His back has healed, thank God, but his head hasn't.
His Grandma had openheart surgery about a month ago and she has had many set backs and now is in post open heart depression, his family is fighting and constantly calling me to deal with everything.....sometimes i just dont answer the phone.
 
Work sucks, the city is laying off and cutting down manpower, (I am a paramedic) so do to my age I dont know how much longer I can do the job...they are going to 2 man crews which means much more exstensive lifting and much more pressure in the back of the truck, we were hit hard with the flus here and our call volume is very high.
 I want to cry and run screaming down the street, I am exhausted all the time, I cant focus or get anything done at home,  I too had a pretty severe head injury about 12 years ago, and have to struggle a little when I lack sleep or am stressed, which for me now is all the time.
My girls are adults but very needy since their father (my ex-husband) died suddenly last fall at work.  I can only do so much for everyone.  seeing his Grandma makes me think of my Dad more and makes me sad, my anxiety is through the roof, I am heartbroken for my girls who lost their father, I am working extra hours and while I am at work I have no idea what my husband is doing....There are so many other things going on that I haven't mentioned that it is all just paralyzing and too much, I feel like I can't breath, and I feel completely alone even with my husband here.
I want my Mom and Dad here i miss them so much, they would make everything ok.