Both my husband and I have psoriasis....I have a mild case of psoriasis, but he has severe outbreaks on his fingers, elbows, knees and feet, and lately he's having joint pain. I've been afraid that he's developing psoriatic arthritis.
Of course you will have to see your doctor and ask what medications will be appropriate for you and your situation. I'm not a doctor and cannot recommend any particular treatment. I can only tell you what my husband does...and as you would expect for any autoimmune disease, prednisone can be helpful. When my husband is on prednisone it seems to make a positive difference in his skin condition and his joint pain. He also takes soriatane and uses clobetasol on his hands when they start to crack and bleed.
Prednisone seems to keep my psoriasis under control as well....mine isn't bad, but it does disappear when I'm on prednisone. Of course, I take the pred for other conditions like autoimmune hepatitis, RA and lupus.
I'm so very sorry that you're going through this....there is a psoriasis forum here at Healing Well, but they don't seem to be quite as active as this forum. Still, if you ask a question, someone usually answers it. You could also try the online forum at
talkpsoriasis.org/, which is part of the National Psoriasis Foundation website. At either forum you might try searching on the phrase "psoriatic arthritis" for helpful posts.
Good luck with everything!
JoAnn