Stomach Problems,(cant Go Out)

Im 24 years male.currently my weight is only 47kg , height 172 cms. due to my very thin body i generally remain sad, dont feel happy even for good news also, some of my problems are as follows:
1.. feeling sad whole day, not able to enjoy, continuous thinking about my bad health, worrying for other family members.
2. very bad sleep at night. lots of dreams, sleep at 10pm but wake up around 1.30am after that brain remain alive but physically very tired and sleepy.
3. flatulence, generally acidity, lots of belching, heaviness in stomach after eating oily and some other foods.
4. diagnosed for pressure urticaria.

I dont know if above sysmptoms are interrelated in any manner but im very upset with all tyhese problems. i had lot of treatments , test reports are clear...but im not gaining weight and feeling happy. can you plz suggest me the treatment and for how much time.