Just wanted to send you a positive word about methotrexate... My mom has had RA since her 20s (she's now in her 50s). She has been taking mtx for years (probably around 15+), and she has never had any bad side effects. It has been such a lifesaver for her! She was even able to run a home daycare for several years. Until the past couple of years, she hasn't had to change her meds, but she now takes a weekly injection of Embril, which works in conjunction with the mtx to help slow down the RA progression.
I realize everyone is different, but mom said she never felt any negative side effects... just the freedom from constant pain and stiffness. She takes 2 pills twice a week, and she said she's never had drowsiness from it either. Oh, and she only has to go in for bloodwork every 4 months. The more frequent checks are just when you're getting started, I think. She also said she has several friends and relatives that take mtx, and she said none of them have complained of side effects from it.
Good luck! Maybe this will be the answer you're looking for! I realize it may be a permanent answer to your struggle to conceive, as well, but that doesn't have to be such a bad thing. There are lots of kids who need loving parents like you! My husband was adopted, and there are 4 other adopted children in his extended family. It doesn't have to cost a fortune, either. Just focus on your health and getting to the point that you're able to care for a child... then you can try to figure out which way you want to go about it.