Irregular bowel, n lot gas. Bt no help.

Hi, i m 28year,5,2"50kg. I have irregular bowel movement and Gas problem from past 3 years.from past 3yrs,m taking good diet,i exercise, no junk foods.there is little improvement,but chances are higher that i need to go toilet after having a meal. In morning, stomach is not cleared in 1st attempt,i have to go 2nd time within 30-60mins,and after breakfast,i need to go within 15mins.i feel something below navel like shit is still there. Now,after 2pm lunch,i start feeling gas ,and around 3pm-4pm,i need to go toilet. but this time also,i dont feel like bowel is cleared.around 6-7 pm i again have to go for toilet. Now,after 9pm dinner,i again feel like going to toilet,but nothing comes out.its all gas inside.all i do is farting from evening to till night.i can feel my stomach bloated for whole day. And,bloating and gas is maximum at night. It takes me 5-10mins in toilet, for every sitting. My bowel is smelly, mashed up,wet,sometime mucus(white/jelly like) at end.i try doctor,bt No help.