Did you say chemo?!

I had my latest rheumy appointment a few days ago. While she was examining my joints she found that I had psoriasis on my wrist and on my ears. I have also been having trouble with my nails. They've been splitting and have gotten dry and brittle. I pointed them out to her she said that it was caused by the psoriasis and that your nails are where it usually first starts. She is now testing me for psoriatic arthritis. Apparently autoimmune diseases like to bring friends with them.
The Plaquenil was not working as well as it should have so it was time to change up my treatment. She had already discussed what the next step was at my last visit. She explained that if I did have psoriatic arthritis too the Plaquenil wouldn't touch it and the next step for my RA was methotrexate and that would also help if I did have psoriatic arthritis. So we decided that the best thing was to start the mtx. She explained to me that it was a chemo drug and that it will suppress my immune system. She told me that I would have to give myself weekly injections along with the Plaquenil. She also added cough syrup, folic acid, and vitamin a to help counteract the side effects. She had the nurse show me how to give myself the injection in my thigh. I was scared but it wasn't so bad. She told me to try my stomach next time cause it's easier there. I'm praying that this will be the treatment that works for me.