Sleeping disorder. A 8 hrs proper sleep.

Since 2 and half years I have been facing sleeping disorder everyday , I used to wake up in mid of sleep anytime and supposed to go for motion for sure ,after that I could not sleep and the total sleeping time per day varies from 3 to 5 hrs only, due to this it leads to severe body pain,stress ,hair itching , complete black circle around eye and face , very rarely I used to have good sleep for about 8 hrs and I  can say it is  once in a month ,all other day I used to wake up in mid and leads to motion and may be due to digestion problem I may wake up but though I feel good after dinner the problem will occur . Since I consulted few general doctors but nothing works out .please help me with this problem since I want to have a 8 hrs proper sleep.