Overtired baby i cant get to sleep. Any ideas?

I'm having so much trouble getting DS to sleep & stay asleep for more than 15-20mins during the day.

Bit of background, DS has reflux but up untill 2months ago when he needed a change of dose, he was sleeping really well, 2-3sleeps of 45mins-2.5hrs during the day & 6pm-6am at night.

Now I'm lucky if I get him down by 8pm & he wakes anywhere from 4am & has started waking once or twice again at night :(. I've tried rocking, patting, walking, dummy, bouncer, swing, bath before bed & baby hammock & nothings working now. Most of the time I spend more time putting him to sleep than what he actually sleeps for! If he feeds to sleep or if I can rock him to sleep he wakes up as soon as I try to put him down.

I even tried the 'save our sleep' routines but DS is one stubborn bub & isn't one to cry himself to sleep, he just screamed the whole time & started scratching his face & head, biting down on his arm & screaming, so I stopped.

He's obviously tired, yawning, rubbing his face & pulling his ears, but as soon as he starts to relax he wakes himself up.

Any ideas? I'll try anything at this point.

Do you wrap him? I used the angel wrap (google it for instructions if you don't know it) on both my kids and it worked really well. Neither of them would sleep for as long if they weren't wrapped.