Exclusive pumping mom

Ca
So my baby is going to be 5 months and I am exclusively pumping to feed since he was born. I pump 2 times at work and 3 times at home, if I don't pump I feel miserable I feel all the milk goes to my head. So many times I wanna give up I can't do any exercises like running, I can't go out too long without my pump, I can't sleep on my belly, and I have to wake up at mid night to pump. So summer is coming I just feel I am keep gaining weight I want some moves, when can I stop pumping ???? Or any exercises won't hurt the boobs