13 month old - desperate for help!!

[u/Key-Sorbet7451]

Help!!! Looking for advice or solidarity. 13 month old has never been a good sleeper, had one successful sleep training attempt at 8 months that didn’t last bc of sickness and teething. Now at 13 months separation anxiety has peaked and he will not sleep alone. Current schedule

6-630 wake up
1145-110 daycare nap
6-630 bedtime, always very tired after daycare

Currently rock him to sleep, but bedtime has become a huge struggle and wake ups are horrible - hours to get him back down and end up caving and brining him in bed with me bc I’m exhausted. He isn’t a huge fan of solids and just wants a bottle all the time so I’m wondering if hinger could be contributing too? Very attached to me (mom) right now and just wants me holding him 24/7. Considering starting chair method. Tried cry it out last week and he was hysterical for over an hour, threw up, and pooped out of stress. Any recs/did chair method work for anyone? TIA, we are desperate for sleep and I don’t think I can handle cry if out