How Can Shoulder Pain Caused By A Methotrexate Shot Be Treated?

I m taking sulfursalzine for quite a number of years. My firxt doctor retired so I sought another one from mt. Sinai in nyc. He gave me an injection of methotrexate in the shoulddr which affected my shoulder. I got terrible pzi so bad I could not lift my arms for a long time. When I told him that, he said it wasn t the injection, it wzs because my ra had progresses eveven though I had no problem before the injection.. now he wants me to add arava to sulfursaldine, three sulfas zll at once and one arva. Doex this sound right? I m afraid to add arva beczuse of shzt happened last time when he injected me with methatrate. Pls advise. Thanks