My baby is 10 1/2 weeks old and suffers reflux ...

My baby is 10 1/2 weeks old and suffers reflux really bad. His cot has been elevated, he is on thickened formula and has recently been put on Zantac. As much as this helps a bit he still is very grizzly and have run out of ideas on how to settle him. If anyone has any ideas on how to settle a baby with reflux it would be much appreciated.