No sleep at night...

I know it's not as bad as some people have it, but my LO (8 weeks) hasn't slept for than 2 hours in a row at night in a week and I'm going insane. She's been awfully gassy at might but doesn't seem like she is during the day? I'm thinking about cutting dairy (except butter) since I'm lactose intolerant I think she may be as well (butter has no lactose). She sleeps in a swaddle with her arms out, in the bassinet in our room. I try to let her fuss in the bassinet as long as possible but I pick her up if she starts screaming/crying. I don't know how much more not sleeping I can do. Any advice?