Exhausted, H E L P !

Since four months old (my son just turned 5 months, he is a preemie baby was born at 34 weeks) has been waking up every two hours every night. I’m dead tired. My body aches, I need some rest. He wakes up and eats about 4 oz to 3 oz of formula. By the time I almost start to get a nice sleep going for myself, he is already about to wake up again. I don’t know what to do about this. I don’t know if this is normal or if this will pass? Right now I don’t see any end in sight.