Immune defence symptoms and conditions

After bith my childrens births I have experienced a enigmatic skin disease / disorder which has been unclassified by dermatologists and specialists. First I experienced blisters on my torso, which crusted over and followed with severe urticaria-like wheels all over my body. Doctors placed me on Prednisone 5mg tablets ( 40mg daily) for 4 months, in which time the symptoms subsided , but the side -effects for this Mother was terrible!!! I experienced a 12kg weight-gain, uncontrollable appetite, excessive sweating, dizziness , shortness of breath and extreme hairloss. My skin thinned and OI bruised very quickly. No diagnosis could be made. After the induced -birth of my second child now, I have the same episode and had been placed on Prednisone for the second time just to cope with the swelling.

I am currently in my 7th week of using 10mg - 15mg daily with an anti-histamine. I hate the re-occuring side-effects and am very scared of all the long-term damage. Does anyone have any idea how to boost your own natural immune-defence system while being bombarded witha immuno-suppressant like Prednisone??!!!!

I believe that your own body ws made to heal itself or be healed by natural means... but how and what?? I am desperate, and have been following a anti-candida like diet ( no yeast + sugars + preserved foods) Thus far I have not been able to kick the symptoms. Any help out there would be much appreciated. Have someone experienced the same sort of symptoms???