My second child had severe colic and cried for 2 to 3 hours a night for the first 10 weeks, towards the end though it was no where near as bad though.
I found my health visitor really great and she had so much helpful advice for me. I've just spent 5 minutes looking for her original advice, just in case you find it helpful as well, as now that he's 12 months old, the sleep deprivation has suitably caused my brain to forget it all
Her tips to try were:
Warm bath covering tummy.
Lying him on his tummy with a warm (not hot) hot water bottle under him to soothe tummy.
Cycling his legs whilst he's on his back. Holding feet palm to palm and rocking legs sideways, whilst lying on floor or lap.
Or scooping with right hand down his right side whilst holding feet palm to palm.
Or rocking him face down well supported on legs.
She also said don't eat anything that gives you wind such as brocolli, cabbage, caffeine, cauliflower, garlic or other stimulants. She said if none of the above did work I could try buying Colief drops from a chemist and mixing in with feed by expressing it first, as she said sometimes colic is caused by a lactose intolerance.
I found that out of all of those the cycling the legs was particularly good. I also found that as he had trouble burping, the infacol made him cry harder as it coalesced the bubbles into one big one that still went downwards but hurt more. But giving him gripe water after every feed straight away really soothed his tummy. I had to do it every feed though without fail.
The warm bath in quiet room was also a real help. Every night at the time he started to get agitated I would put in the bath, in a bath cradle and keep putting warm water on his tummy and every now and then top the bath up with warm water, so it wouldn't get too cold for him. Once or twice he was in the bath for 2 hours in the early days as it was really calming for him. Once he started doing big yawns and it was bedtime, I'd take him out into a dark bedroom and change him and BF him quietly and then often he'd go to sleep straight away.
But let's face it all babies are different and these may not work for you but it's always worth a try!
Goodluck x