Sleep coach?

Before you do that, you could take your little one to a naturopath. Combined with the well-known sleep sack, it helped us a lot.

Here's an 11-month-old who's going through such a phase. It could be teething. A leap in development. Just being anxious.
How is the sleep cycle during the day?
I'm lucky that my daughter falls back asleep quickly with breastfeeding. She needs that sense of security for a bit. And when she wakes up around 2/3 hours later and falls back asleep, she usually stays lying with me. Otherwise, I'd have no sleep at all. They're still so small....so they often just need to be with us. It's also very natural, actually. But very exhausting!

Have you already brought him into your bed?

Sleep is a problem for many children. Even when they're much older. But it really does get better.

Maybe try googling "learning to sleep." Some children really need to learn that. I read that you've already tried a lot. Many different things. Figure out what feels right for you and is feasible, and stick with that.

I'm all about co-sleeping. That worked best for all 4 of my kids. Gives us more rest and the kids too. You don't have to get out of bed all the time. Whatever method you choose, stick with it for at least 4 weeks. It really needs time. Wishing you lots of strength!

A neighbor also tried a sleep coach, which didn't work at all. She had to sit by her daughter's bed all night. They set their own boundaries, and now it's much better.

Strength!

I really don't have experience with sleep training at that age. My daughter slept poorly for the first 4 months, then we switched to bottle feeding, she got her own room, and we just had a bit of perseverance. She moved to her own room at 4 months because she simply woke up from us being there. A light sleeper. We started with daytime naps. I hate letting them cry it out, but I noticed that picking her up made it worse. She'd stop crying for a bit, but then she still had to sleep, so back in the crib she went and she cried twice as hard. Eventually, I stuck with it: didn't pick her up, but went back every 2-3-4 minutes or so to give her a pat on the head, a kiss on the pacifier, and say it's okay, mama is with you. The first time it took about half an hour or so, the second time was shorter, and soon she went to sleep without crying. Fixed it during the day, and she carried that over to the nights on her own. She's still sleeping well since then, and I'm glad I stuck with it. She became much happier, and so did I Of course, there were tough nights after that, and if she cried a little, I cried just as hard with her. Now, when she's sick and wakes up at night, she doesn't fall asleep right away. She needs to reset, go downstairs, play, cuddle, etc., and then back to bed. Sometimes after a sick period, we had to pick up the pace again, let her cry a bit. But it was only once, and then it was over, and she just slept again. They figure it out quickly. Our little girl is about 21 months now, and she cries just like yours when putting on the sleep sack, hates it, and really tries to run away. I think she realizes at that moment that it's really time to go to sleep. So, hop on the sleep sack, kisses, and to bed, and she stops crying. I've tried putting her to bed without a sleep sack, but then she doesn't sleep, she just cries. The trick here is that we haven't changed anything about the sleep routine at all. So whether it's hot or cold, same sleep sack, same music, same lamp, opening the window suddenly caused drama too. You really need that regularity and see that crying or throwing a tantrum doesn't help. It sounds easy now, but I know exactly how hard it is. Every child is different and has their own manual. I can't judge how your child cries/acts or what they need. Maybe a sleep coach is worth trying. And I'm sure I'll have to search just as hard for the method with my second one Every child is ready at a different moment, but they benefit from it themselves. With calm and regularity (gosh, I sound so old haha)