Ok where to begin?

Male 24

Well about a month and a half ago it started with diahorrea and stomach cramps everyday withbreaks of 2 to 4 days inbetween which i can poop normal or have constipation, ontop of those i have severe stomach cramps, nausea and slight headaches.

Now for the last 7 days ive still got all of those except ive only been about to poop once and that was only a very small amount considering ive been eating normal.

Also my GP has cleared me of Viruses, Parasites, Thyorid and bacterial.

Any help would be appreciated.

Luke