These baby tears break my heart

My baby will only produce tears when he is really upset or I take too long to make a bottle.

Earlier today he was crying in pain (I assume gas pain but it's been a couple of weeks since he's had gas problems but no hair tourniquets so idk what else it would be) and he was making eye contact and screaming so hard and crying real tears. I just wanted to break down with him. It's like he thought I could help him but was choosing not to. I did everything I could think of to help. He eventually calmed down and fell asleep but man. My heart still hurts. :(

I hate seeing my baby in pain and these tears make it worse. Why do babies need to produce tears? :/