Toddler won't sleep alone

My toddler (2) recently had a short hospital stay due to an asthma flare up and understandably on returning home took a couple weeks to regulate again. He's doing great except sleep. The first night we got back from the hospital we put him to bed as usual in his crib, he went to sleep no problem like always. Unfortunately he was on Q4H nebs still and he accidentally was awakened twice for his neb(we can usually do them and he's still asleep) so after the second wakeup he wouldn't go back down. Eventually I let him in bed with me. Well since then it's just getting worse and worse. We ditched his crib because he wouldn't go near it, got him a toddler floor bed. He started off just needing someone to fall asleep with him which was fine. Then it was waking at night and we think he realizes he's alone and gets upset so one of us goes in 5-6 times a night. I really really really don't want to make my toddlers floor bed my new permanent sleep spot. And we're not cosleeping in our bed. So- my ask is not if we should or shouldn't co sleep its if anyone has actual real advice on how to help him regain his ability to self soothe even a little?