We're 3.5 months old. Sleep regression is starting to show itself. We …

We're 3.5 months old. Sleep regression is starting to show itself. We can't put the baby to sleep without tantrums and tears ? especially daytime naps, I don't even recognize my child anymore, he used to fall asleep peacefully on my chest. It's been getting worse for over a week now ?. He only falls asleep when you pick him up, rock him for 15-20 minutes and still fusses, pushes away. We try not to exceed his wake time. Please share your experience ?????? How did you get to SZZ? What methods did you use?