It's very common at that age, I'm afraid, and switching to ff probably wouldn't do any good anyway.
Try co-sleeping. It'll help if he's needing to feed more often for whatever reason. And it'll help if he's suffering with separation anxiety.

Basically, just do whatever is going to get you and him the most amount of rest. Carry him in a sling, sleep with him, nap when he naps, get someone else to watch him for a bit during the day so you can nap... whatever.

All the best Hope you're out the other side before too long.