HI T.
Not sure exactly if it is related but, When my son was about 5 or 6 months, when I completely stopped breastfeeding, and went to milk, he threw up alot. I am talking projectile vomiting, It was quite scary, It took me a while to catch on, but I switched him to soy, and lactose free formula, and the same for the milk. Wow, what a difference, no more spitting up. We too have had pink eye, a few times, right now being one of those times, and although my son is a little older he has not exhibited any spitting up. Although, depending on the prescription, does the antiobiotic have sulfur in it? Sodium Sulfacet is what we have. Some children are allergic to sulfa, as my daughter is, so she is not on the drops, she is on omnicef. Does the spitting up happen right after eating? Try a lactose free or soy milk, it may just suprise you, Lactaid, or Dairy Ease, or even Silk(soymilk)or even soy formula. Good Luck
C.