Got this balance problem of feeling unbalance when walking since dec 2010. Also had allergy skin red and itchy. Went for mri scan and everything seems ok. But the balance problem still around. Sometimes feel so tired while walking especially in evening after office. Sometimes its weakness in the knees. Is this some sort of virus/flu/bacteria infection somewhere? It felt as though i m losing control over my body, my head feels disconnected from my legs.