Scared of Divorcing suffer from a chronic pain condition?

I am in a very unique situation, have had many say this. The short is I'm 29 attractive, smart & interesting (although most days do not feel this way). I devoted my life to my husband, been together 10 and married 6yrs. I have a pain condition, but pain meds allow me to live a somewhat normal life. Never had to work and it took me a billion years to finish my BA, b/c at the time I was in worse shape, in the last 3 years I've been doing a lot better. He is a serial cheater does not wear condoms, basically became non-existant after marriage - he had a million excuses, but the fact that he would cheat and wait to get tested was a real killer alone, not to mention his reasoning for having affairs is that he desires nsa with strangers in a more fashion than he wishes to do with his wife. I am extremely scared b/c I am very much alone in this & the health condition and lack of work experience does not put me in a very well starting position. Don't know what to do!