I observed that my memory''s been deteriorating so fast. sometimes, i even forget which hand is used for fork. can this be a serious problem?

Fibro-fog?: 20's females with "failing memories" are well before mental deterioration common with agedness. In this young age group there is concern for depression, fatigue & mental fogginess associated with fibromyalgia. Sleep disorder and non-restorative REM-absent sleep can impart depression, daytime fatigue & cognitive disturbances. Gentle exercise and sleep hygiene are advised.