Hi Traci, make sure you drink lots of water while on mtx, are you getting bood tests taken? I know they're suppose to monitor you closely when you start it.
Worries me that they are not supervising you properly.
Meanwhile take fish oil as well. It's suppose to be a natural anti inflammatory and my rheumy swears by it. I also take something called osteoappetite which has chondralton, glucosimine, boron, calcium all good bone/joint helpful supplements. I came off it for a while and noticed the difference so it must be doing something useful!
Hopefully the RA diagnosis is wrong but we're here for support whatever the results are for you. These auto immune diseases often have cross over symptoms, not nice at all.
Best wishes, golitho