fussy at breast?

MamaBear🐻🌼 • 26, Mom of two-proud Navy Wife & SAHM
My 2 month old is so fussy when I feed him not always but half the feedings in a day, he's on and off and seems uncomfortable, 
I think my milk comes out fast but even after the letdown slows down he's fussy at it, he seems to gulp and cough a lot...... he's also gassy I looked up tips to slow my milk down but it's hard... he still gulps it.... getting ready to cut dairy but really wonder if it's just simply me oversuppling although my breasts never feel to full......   
any advise anyone else...  ...I hate how confusing this is 😩 he's up all night with gas and poop probs ugh