please help choose a remedy

I am too much worried about my health condition. I have a very low confidence. I think I can do nothing in life. I am indifferent to various things in life. I have congestion in head all the time with mild headache. I feel heaviness inside head all the time. I fear of my health and I always want somebody by me because of the thought that he/she might help me if my health deteriorates. I don't like to talk to people but I talk to them and keep them just to get a help in case of a need. I have poor concentration, poor memory. I am always sad and depressed. I cannot go and meet people in the crowd or in parties. I become nervous when I have to talk to somebody. I fear of making mistakes in anything new things if I have to do. I don't like anybody controlling me. I don't want to be dependent on anyone but because of the mental problem I have to rely upon others. Sometimes I fear of insanity and sometimes of death. My depression problem is a chronic problem. But the fear of death is since 2 yrs back. Please suggest any remedy and its potency