3-4 month sleep regression

I know there have been other posts but oh my god please help!!! Does this end?? He was doing 6-8 hours then 3 more then 2! Now he does 3 hours, 2 hours, and up every single hour after. I swaddle, obviously dark room, fan for noise... I've literally done nothing different. This has been happening for a week and he wakes up at the same time every night. =[ I'm so tired I'm the only one who wakes up with him, I just want to know if it gets better like the other sleep regression? I keep hearing this one is permanent, WTH. He is cranky as hell too =[ poor little guy I want him happy!! Words of encouragement? [=