I am feeling very low from the past 3 weeks , I don't know the reason but I m feeling sad , the joy , life , vigour is Missing , My heartbeat has gone up and feel frightened sometimes I don't feel happy and irritated and frustrated at the same time I don't have appetite and feel sad .... Sometimes I have very disturbing thoughts and suddenly I feel so much depressed that I wish to cry .. I sometimes feel I should not think over these and remain happy for sometime but again I become sad I m alone