Relief for Baby Reflux

My almost 4 month old suffers from reflux since birth..we switched bottles, formula, hold him upright, added cereal (dr recommended) etc. all the usual "relief fixes" I DON’T WANT TO PUT HIM ON MEDICATION! He is a very calm baby & isn't really fussy but our main problem is spit up 😳 every time he eats he spits up EVERYWHERE..I'm so tired of doing so much laundry & I'm sure he doesn't like spitting up!! I read about probiotics helping lessen/eliminate spit up & I plan on discussing it with his pediatrician at his check up Friday! Has anyone used Gerber Soothe Probiotic Colic Drops FOR SPITTING UP & found relief!?