My 16 year old son has been on prednisone for 7 years for Hashimo...

My 16 year old son has been on prednisone for 7 years for Hashimoto's Thyroiditis, Asthma, and Idiopathic Angio-Edema (deep tissue swelling/hives) with Chronic Uriticaria (Hives). He started on massive doses but in the last year decreased to 10mg every other day. 3 weeks ago we discovered he has developed scoliosis due to the long term use of prednisone. They tapered him off in 2 weeks. Now 1 week later he is having a type of withdrawl from it... weakness and no energy, nausea and headaches. He is never allowed to take prednisone again, and now the doctors are talking about putting him on cyclosporine. Has anyone experienced this too?