I develop abscesses in my underarms very often, which grow real big and painful. it feels like these and my acne are linked to my stomach's health. tq?

Depends: The question is if you have "only" furuculosis (which reflect a deeper form of hair follicule infections, also known as folliculitis) or another condition called hidradenitis suppuritiva. The latter condition is due to blockage and involvement of sweat glands in that area and can lead to sinus tracks, drainage, and concomitant scarring. You need to be clinically evaluated by a dermatologist.