7 weeks in and I think we finally figured out the gas
So my wife and I have been going insane trying to figure out why our son screams for like 2-3 hours every evening. Everyone kept saying 'oh that's just colic' but I felt like we were missing something. Tried everything - different bottles, different formula, burping techniques, the whole deal. Last week we switched to a different formula that's supposed to be easier to digest and holy crap the difference is night and day. He's still fussy but nowhere near as bad. If anyone else is dealing with this, definitely talk to your pediatrician about trying a different formula. Could save you weeks of stress.
Two to three hours straight? That's rough. Have you tried the bicycle leg thing while he's on his back? My wife swears by it. Also white noise helped our kid calm down faster when he was uncomfortable.