Frequent night wakings and colic

Hi everyone! Just need to vent here: my almost 17 week old daughter changed her sleep pattern when she turned 12 weeks old. She was sleeping around 6 h , feed then 3-4 h more starting at 11pm and it was amazing. Then it became less and less, 5, then 4, 3 and now she is sleeping in 2 h stretches, some nights 1h or even 30 mins. Her bedtime is now between 8-9 pm. Most nights she has around 5 wakings, some it can be 8. She falls asleep easily at the boob though. I am just so freaking at my wits end. Also, mathematically every night she will start straining and kicking her legs, moaning in pain at around 5 AM. I have to give her a massage and then she lets out gas, poops and falls asleep. Her poop has also changed, its very very runny and a bit mucusy. I havestarted bed sharing even though I was against it because I couldnt cope with the wakings. She is still swaddled, otherwise she will flail her arms constantly. She also started pulling at my nipples last night, this never happened before and it freaking hurts. I feel like I am a failure :( i have eliminated dairy a week ago from my diet, I drink anti gas tea, I barely eat anything because I dont want to make her sick. she is a very happy baby, always smiling and barely cries, very tall but gaining slowly. Im just so overwhelmed at night, tired and cranky and crying.. my husband helps a lot getting up with us and I even resent that because he is so incredibly patient whereas I get frustrated and impatient instantly. 😩