This brought back so many memories for me of my 1st baby! I used to drive to my mums with a screaming baby and me bawling! Once I put Jess in her capsule on mum's doorstep, rang the bell then went and sat in the car crying. I can remember holding her just saying over and over again"shut up, shut up, shut up" I was advised to give her mylanta after each feed and that really helped, I am not sure if that's still advised cause this was 1991 but boy was it a godsend. I would try and find a doctor who recognises colic/ reflux and will help.
Please don't beat yourself up, it truly is such a difficult thing to deal with and when you are young and its your 1st it feels even worse.