I have been taking Prednisoner about 2-3 times per year for my al...

I have been taking Prednisoner about 2-3 times per year for my allergies and asthma for the past 3 years. Usually I gain a few pounds and have insomnia for a day or two. This time is out of control. I stopped taking it almost three weeks ago and I still have insomnia, neck stiffness, fatigue, a low grade fever, nausea and a sensitivity so strong to heat that I have a panic attack every time I get hot or go outside. My doctor has no idea what to do. He said it will go out of my system eventually. Suggested lots of water and a detox diet of brown rice, beans and veggies - no refined flour, sugar or caffeine. Anyone having anything similar? Xanax doesn't work for me. I've been taking Benadryl to sleep.