Parents of infants with Reflux Question

Jamie
My 4 week old has reflux. He's bottle fed and was super fussy with regular endamil formula. He's a very good eater through all our formulas. Then we tried a similack hypoallergenic formula- forgot brand name -which didn't help either, then we switched to nutronogin. He has been way less fussy but is spitting up even more then normal. And we hold him up thirty minutes after feeding, towards the end he starts spitting up little bits but over and over. I can't stand this I feel so bad for him. I guess we're switching formulas again. Any suggestions?!