Boosting milk supply

Jennifer
My son from birth was breast-fed and then at a month and a half he was still wake up every 45 minutes to an hour so Doctor had me supplementing with 2 ounces of formula after breast milk well little did we know after trying six different formulas and changing  my diet that my son had a milk allergy and acid reflux due to his acid reflux and me not wanting him on meds I stopped breast-feeding him at around 2 1/2 months and took him off medication because formula is thicker it helped keep things down better cuz after breast he would spit up everything; now he is 3months and shows very little to no signs of acid reflux at 41/2 months dr and GI want to try rice cereal to help him but now since he's showing no signs or very little I want to go back to breastfeeding him but how would I go about getting milk if I squeeze my breast some milk comes out; plz help