Becoming depressed

I was diagnosed with PCOS after months of being in constant pain. They don’t know where the pain is coming from, but they gave me prescription medication for the pain and it doesn’t help. They told me the only thing I can do is take the other pills which are supposed to regulate my cycle again. Take those and wait for the pain to go away in a month or two. But it’s getting to me. I’ve been gaining weight every time I BREATHE. And I can’t seem to lose any, especially now that I can’t do much since if I do too much it starts hurting really bad that the pain makes me cry. I used to be able to clean the whole house without stopping with no problem. Now I have to stop periodically, or if I do the whole house without stopping I’ll be crying in the evening from the pain, and the pain will continue into the next day. I’m starting to become depressed because I’ve never weighed so much in my life. Diets aren’t doing anything since I can’t work out too. I don’t know what to do. Any words of encouragement?