Help with health

I was diagnosed with Rheumatoid Arthritis and Lupus recently.  Doctor put on a medication to help cancer patients and taking it has improved my life but I can no longer take any over the counter pain relievers. If I have a minor ache or pain I can no longer take Tylenol. 3 years ago my knee went out on me and I need replacement surgery but need to lose weight. A struggle that I have had all my life. The main reason for my request is that I have been thinking about ending it all and my love for God is the only thing stopping me. Please help. ChristineÂ