I have severe Psoriatic Arthritis. Here are some of the things I've done:
Prednisone Blast--sometimes even more effective than reg. prednisone. It'll give you a high blast of it. Ask your doc about it
Cortisone Shot--If you have one area of particularly bad inflammation, a cortisone shot will relieve the swelling and pain.
Non-pharmaceutical options: epsom salt bath, heating pad and arnica cream. Sometimes reducing dairy and gluten also helps when the pain is bad. Acupuncture also works well, but you usually need to go more than once.