hi sanv..gbs is an auto immune disorder,in which body produces antibodies against our own neural tissue cells,triggerd by some infections(like campylobacter ,cytomegalo virus.mycoplasma,)causing progressive muscle weakness,starting legs migrating up involving hands resp.muscles,sometimes neck muscles cranial nerves. .the condition may last from 4 wks to 6 months usually....the main treatment modality is supportive,immunoglobulins and plasmapharesis if reqd....... .gbs recurrences can occur but rare.......more than 90% of pts recover significantly or totally by 6months with out long term problems....but pts have to continue rehabilitaion physiotherapy,muscle and breathing exercises... usually steroids donot help much in gbs,but in cidp whih is a variant of gbs steroids have a signicant role,,recurrences can occur .with varying severities and are unpredictable..your doctor might have put based on your clinical condition..long term steroids should not be used as can cause some problems like infections,reduce immunity bone and joint problems..as stated hiv -ve do not worry..,,consult your doctor(as he is the best person knowing your health status,response to treatment and side effects) regarding slowly tapering steroids and adding mild immunosuppressants which are helpul in your condition ,avoid infections,stay healthy eat healthy,continue physiotherapy and breathing exercises..,,,as gbs can affect breathing system better you totally stop smoking take care of infections use antibiotics as required.. best wishes ,take care