I believe that you are absolutely correct in your diagnosis of prednisolone toxicity, and most (if not all) of your problems are related to this...
The treatment would be simply stopping any further treatment with steroids.... For acute arthritis the best treatment would be to take strong pain-killers during the acute episode and disease - modifying agents like methotrexate etc. on a long term basis since these should possibly reduce the chances of acute exacerbations...
There is no specific medicne that will take care of all the side-effects, though taking a diuretic for water retention and aggressive antibiotic treatment for preventing spread of infection is recommended.
Also you need to make sure that your vaccinations (shots) are up to date including the FLU shot/ Pneumococcal/ chicken pox shot, since as you are aware your immunity is low and you a e at risk for infections
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Dr. Gupta