Why is my baby worse at night than the day?!

So back story, my March baby was sleeping 6-9 hours a night at 4 weeks old, she would wake and nurse for 10 minutes and back to sleep for another 4 hours, until her 4 month sleep regression. The regression lasted 6 full weeks 🙃 and she was back to sleeping 5-6 hour stretches for 2 weeks and now she’s 6 months old and it’s hell again. I know there’s another regression in there but for the last 12-13 nights she wakes up screaming an acts like she has a belly ache/gas. I have to sleep in a recliner holding her most of the night, when she does let me put her back in her bed she sleeps maybe 30-60 minutes max and she’s up screaming again. Some times she only screams until I pick her up and sometimes it’s for 5 minutes. A little Tylenol seems to help but I don’t want to have to resort to that all the time. I haven’t changed my diet in any way really and she is totally fine during the day, never screams like that at all until about 11 pm. I have her bassinet slightly elevated as she had an ear infection a month ago and when I lowered it, she slept worse. Any ideas would be greatly appreciated! Thanks mamas!

-a mom who is slowly loosing her sanity along with sleep🙃