12+ yrs on prednisone for colitis. Off and w/withdrawal issues. Pain, immune related. Adrenals ok. Who to see?

Off prednisone and then on entocort. Now having various immune system issues inclusive of skin, widespread body pain. Stim test OK, so while adrenal glands are OK, rest of body is trying to recoup. Need the right specialist for steroid withdrawal symptoms. Thanks.