Breastfeeding issues?

I have been exclusively breast-feeding my son for almost seven weeks now. I am not sure why he started this but he gets so fussy when I try to feed him. It's not a latching problem because he is gaining the right amount, he has the correct amount of wet diapers, I don't have any soreness or pain, and he takes deep gulps when he drinks. I have tried every different position possible to feed him and it doesn't help. I don't think it is anything I am eating because I have cut out the things that seemes to make him upset and it didn't help. I don't know what it is. I don't want to introduce a bottle but I think maybe I should to see if it will reduce his fussiness. I would pump for the bottle but I was wondering if this would effect my supply at all? Would it effect my supply if I solely pumped? would it be difficult to find additional time for the maintenance of the pump and everything else? His fussiness started in weeks two sometime and has only gotten worse. It seems like it might be gas because he starts kicking and pulling and pushing my breast so I can't get it in his mouth. When I swaddle him it seems to get better but not all of the time. Should I just try to wait it out? Has anyone gone through this before? It gets so frustrating for the both of us I feel like I am a bad mom for not being able to fix this for him.