I've never used one of these forums so forgive me if I babble a bit!
Hang in there. I think you're on the right track. I breastfed all 3 of my kids. They are 18 mo. apart each so I understand how tired you must be now! Your baby may just need to learn to soothe himself. The good news is that now is probably the perfect age to start.
My first son wouldn't sleep without being nursed, held and rocked. This extended into naptime routines too (try to avoid this - it will be so difficult when they're older). I would always nurse them back to sleep because I felt bad letting them cry and didn't want to wake up the other kids. I tried a different approach with my third and it paid off much more quickly!
My third son is a great sleeper now! They don't learn to soothe themselves overnight. It will take some time - hopefully a week or less. We started when he was 10 months as well. We have a very consistent bedtime routine. I tell him that after books we're going to sleep. The baby turns off the lights after we read (I help him too). Then I put him in bed, say our goodnights and tell him that I'll see him in the morning. We always turn on the FP aquarium too. Then I set a limit in my own head, i.e. don't let him cry more than 30 minutes. The amount of crying cut in half almost each night. Then we were done.
Once he learned this then going back to sleep when he awoke at night was much easier. I relied on my husband to help wean the baby from the night feedings. My husband would get the baby when he awoke, check his diaper and put him back to bed with a little soothing (and the aquarium). Once the baby stopped expecting me to nurse him, he just would go back to sleep on his own.
I hope this detailed information is helpful!