Carrying worked for me. Plus cutting out dairy products and baby massage.
DC2 (also) had colic - don't know if it's this, could be? Carrying him about in a sling really worked - specially when out in fresh air. I know it can be tiring, but I found it less tiring than having my ears bashed. Supermarket trolleys are just the right height to balance a bottom on when using conventional front sling with bubs snuggled against you. Also if outside, sound does seem to be less intense.
Baby massage was lovely because it helped me feel closer and have a lovely time with my very noisy baby! Plus did DC2's tummy every nappy change during the day as it seemed to help and I saw other mums coping with noisy babies at the sessions, so didn't feel quite so in the minority.
Is he burping ok after a feed - had to walk up and down stairs lots with dc1 before burps came out and if dc1 was laid down with wind she was really wrestless.
Could you pump to increase supply, and ru drinking lots of water / soft drinks, that can help get thru flow?
I agree with snippety about demand feeding, though it can be tiring (to say the least!) - so glad to find out I'm not the only mum with a good and bad boob at the beginning. Once flow was good I used to feed off one side for an hour and then move over to the other side is dc2 was snacky as I used to get so engorged with dc1 if I swapped sides too much and IMO it means bubs gets to the hind milk if they're only snacking.
Good Luck - it soon passes!