Omg I can't do this anymore!

LO is 3.5 months tomorrow. Hasn't slept well for weeks. Now he has become nearly impossible to get down for the night. We give him bath, play song and used to give bottle of formula to get him down. Now he seems to need side lying boob and bouncing alternating for over an hour just to go to sleep. My body hurts and my nipples are raw. I feel like I'm banging my head against a brick wall. Even when he eventually sleeps its only for a couple of hours at most and then its back to the all night boob buffet and co sleeping 😩

I know he's too young for official sleep training but is there anything I can do now? I try so hard every day to make sure he has 4 naps and at least 3 hours day sleep but it makes no difference and I feel like a failure. I break down and cry every evening because I don't know what more I can do. Maybe it's early regression but it's been like this for weeks!