What is the ticklish feeling from inside the stomach which doesn't let me sleep?

Abdominal discomfort: After ruling out pregnancy that too after 2 nd trimester, and no associated diarrhea, it would most probably from excessive gas. Pay attention to type of food causing this problem, you may have mal absorption, most commonly to dairy products. Try some probiotic and lactaid and see the symptoms gets any better, if not have it checked out.