yeah and if he is still gaining weight they'll say there is nothing wrong! But they are not the ones who have to try and cope with a screaming baby!
How long did u give the Zantec a go for? Cause i found it took about 2 weeks b4 i think it was helping Nixon.
You could try taking him to a chiro or Oesteopath? Again it can take 6-8 times before he may noticably be any better. Its hard but it's one of those things that i think if they get, no one thing will cure it but some things may help.
The main thing is the pain, if he is very unsettled, does he spew alot? Things like always propping him up on an angle might help him rather then flat on his back. Nixon is still on an angle in bed and druing the day he is either in his ricker on propped on his boomerang pillow. and instead of tummy time on the floor, tummy time on your/dh chest.
hang in there, you are doing a great job and it sounds like you have been very patient and trying to get to the bottom of the problem. Ive been told it can last until they start solids or it can last until they are upright ie walking. But if you can get the pain under control and he still spews but is happy about it than you can live with that