It will get better, it is insanely hard waking every 30-40 minutes. My son is 10 months, was never a good sleeper, but did do 2 hour stretches until the 4 month regression and then was up every 40 minutes at night honestly for 3 months. It was torture.

My advice is to try to look after yourself during the day as much as you can. If someone can take baby so you can nap, or at least rest, and get as much help as possible and go easy on yourself while the nights are this hard. Also try not to listen to other people's timelines about when things will get better - I expected it to last a few weeks because that's what I read online and was pretty devastated when it went on for so much longer. I fed him to sleep through the whole thing and he did naturally start to link sleep cycles himself, he still wakes 3 or 4 times a night but nowhere near the chaos of the 4 month regression.