@Holcroft
Mines 16 months and still wakes all the time, I am starting to feel I will never sleep again!
Don't worry! It will pass.
For reference I had 3 dc who slept very differently.
By 8 weeks dd1 went down at 8:30 and slept until 8:30. She also had 2 2hr+ naps during the day.
DD2 decided to do the opposite. She would eventually settle about 10:30, then wake around every 2 hours until she got up at 8. She did this until 20 months when the doctor gave her the no-longer-allowed-to-prescribe but wonderful medised. She had a dose for two night running and then slept okay. We're talking about sleeping 6-8 hours at a go. Was bliss!
Ds slept well when he didn't have an ear infection which was about 25% of the time. But he was an early bird. I used to desperately try and keep him awake until 7pm or he wanted to get up for the day too early.
I remember well how you felt. The utter exhaustion-and I can remember saying exactly that to DH. If I went to bed the instant they went to bed, which I needed to, then I never got any time to do me time, and that drains me too.
I don't think that there's an easy option. For me dh used to take them out for a couple of hours at the weekend and the sleep knowing I wasn't going to get disturbed was much better.
Hope you get through it soon.