I don't know what to do.

I'm not really looking for anything, I guess just typing this out will help.
Here's the deal,
after a couple of years of me just passing out, I was finally diagnosed as having bradycardia. That means I have a real slow heart rate. I got a pacemaker put in my chest this past November. I was very soon after diagnosed with Central Auditory Processing Disorder also. If you talk to me, you need to be looking at me and speak slowly. No background noise. In January I had some problems with the pacemaker causing me to have a small heart attack.
To top all this off, I had a T.I.A. stroke last month. One thing after the next.
I can deal with me, my thing is, my wife.
I truly don't think she understands, cares, or believes that I've been sick. I'm on the phone talking with someone, she has to interject into the conversation. The DR. has told her, several times, that she can't do that to me. It causes me real problems.
She started bitching at me because I didn't jump up and fix a molding in the house the other day.
She was diagnosed several years ago as Bi-Polar.
Living with a Bi-Polar spouse is a experience all it's own. She can't hold a job for long, she will work a few weeks, next thing I know, she's home saying she was fired due to some conspiracy against her.
She has triggers that cause her to zoom to the moon. Usually her lazy *** son or the grandchildren.
The grand kids, she has little patience with after awhile. That, I can fix. Her son, he's just useless. 21 years old and won't work. He joined the Army and was kicked out for refusing to train. He lasted 3 months there. Hasn't hit a lick since. He had the nerve to start a fight with me after I had the heart attack. The night I came home he punched me in the side of the head. I saw red and beat the **** out of him. Needless to say, he don't live here no more.
So that causes a lot of stress.
The real kicker is, last week, she accused me of cheating on her.
I've been sick, so the last freaking thing I want around me is another woman. I've never even thought about cheating.
I won't just walk away. I'm not really interested in that. I guess just writing this out and letting off some steam is going to have to work for now. I don't mean to put my stuff in the street, but this the closest thing to therapy I got.
I'm at wit's end, life shouldn't be this tough.