How do I resolve digestive, skin, menstrual issues at 20?

I 20 year female , i always have some digestion problem feeling bloating constipation and from 6-7 year i always had pimple on my face and neck and from last year my menstrual date always increase in every month's there is so many mood changes as well . Feeling like some cramp in my lower abdomen . Poop is also a problem . My weight is increasing slowly slowly even when i am not eating bad my stomach fat increase so much . How do i get rid off alll the problem