When you had the tongue tie cut did they give you exercises to do with your baby before each feed? This is really important - some babies don't need it, but a lot do.
My DS is now almost 9 weeks old and I posted here when my son had tongue tie in the early days. I did supplement with formula until the tie was cut, as my nipples were bleeding and blistered. But once cut I have been exclusively feeding breast milk. It has been hard because he has cluster fed a lot, and it's actually only turned a corner for me this week. People do say it gets better, and that feels so far away when you're in the middle of marathon feeding sessions and you're knackered.
When my son got the tie cut (we had this done privately at home), my DS couldn't work out how to use his tongue again and couldn't suck at all, and he was very distressed when I tried to put him to the breast. I was so worried about him. I was told to do the following before every feed to help his suck:
Stick a clean index finger in his mouth with fingernail down to the tongue and the pad to the roof of his mouth. He should then start to suck - but it might be quite a weak suck.
Next trace your finger around his mouth and you will find his tongue follows your finger. Do this a few times.
Then get him to suck your index finger again and his suck should be stronger.
Repeat this process two or three times before each feed until you feel you don't need to. I had to do it for two weeks. And I still do it periodically even now at nearly 9 weeks.
There are more suck training techniques, but this was the only one I was told to do, and it worked. But you can find more online if you google.
This might not be the problem, but I thought I'd offer this as something to try.
If you think it's wind though, don't be afraid to try infacol. My DS got wind from 2 weeks and it really helped him.