I am so thin and feel ill. Unconscious.

Plzzz suggest me how to increase my weight. Every time I feel laziness and pain in my muscles. And I can't be confident for my personality. I have taken some medicine before but I feel good due to the period of treatment but after this I feel laziness. I am allergic. My personality is not as my profession. Plzz Dr suggest me to increase weight.in my profession there are lots of work and 10 to 7 duty time. I have some headache in every 15days to 1 month .I take banana shake daily in the morning.and take some sprouts. 12-1at lunch time take 4 chapatis and 4-6 chapatis in dinner.my diet is gud but not gaining weight.before3year a doctor suggested me for endoscopy but the report was normal.if I couldn't eat or sleep on time I became unconscious. And feel I m just falling down.I feel very weakness .and thatswhy I can't make my family happy and satisfy. My friends and relative always prank on me. I have allergies from soil,dust,weather change,air conditioners.I often feel cold and this is it