Why won't my 8 month old baby sleep through the night yet?

I am at the end of my rope. In the 8 months I have been a mom, I literally have not slept more than 3 hours at a time during the night due to my son waking up for feedings. I have tried letting him self soothe back to sleep. That never works. Just makes him more and more upset. I have tried just giving him his pacifier, but he continues to cry and spits it out. The only thing that calms him down is a bottle. After that he almost immediately goes back to sleep. I put him to bed around 9 or 10 every night. He will wake up by 12 for a bottle. Then again at either 2 or 3. Then again at 8 for good. This can’t be normal. At 8 months?! I’m a zombie. I’m a single mom who needs to get a job asap and I can’t imagine how I will manage working a full day after no sleep the night before! The dr said every baby is different and some don’t sleep through the night for awhile. But I feel like thats just a generic answer. Please help…before I go insane.