sorry to hear about that.
Just asking if he is projectile vomiting or not?.
My son had the same problem, when he was 8 weeks old. He was projectile vomiting after each and every feed anywhere between 1-30minutes after each.
I took him to a doctor who told me to come back in 2 weeks, i wasn't satisfied and got a 2nd opinion. I am so glad i did. He was diagnosed with "pyloric stenosis" which is basically a blockage of the stomach, in other words when the stomach tightens and contracts to push food down into the small intestine it backfires and therefore causes the vomiting. It was fixed surgically. I AM NOT TRYING TO SCARE YOU. (just had to get that across) but i would urge you to get it checked out.
Good luck. let me know what happens.
you can email me at email@example.com
Aleks, SA, 5yr old girl, 9yr old boy&bubs 10.4.04