Baby won't sleep, dad left, I'm so tired

My baby boy is 7 months old and rarely sleeps through the night. He was doing pretty well for a while waking only once. But then his dad left us and he got pneumonia and two ear infections, so he started waking every hour or two at night. He's still waking multiple times a night. We have a good bedtime routine and he always gets placed in his crib, already asleep, at the beginning of the night. But since it's just me now, I've kinda given up on trying to put him back in the crib once he wakes up. I just put him in bed next to me, give him his bottle, and he falls asleep in just a couple minutes. He can't go back to sleep without his bottle and won't take a pacifier. I am getting so tired of waking up every two hours or so. I never intended on being a single mom of a baby, but my ex was selfish and put me in this situation. I need to figure out how to get control of this so we can both get rest. Momma is doing this alone now and it's so hard to be up all night every night and work full time. Please help mommas!