Emergency breastfeeding help!

So long story short.. My son has all of the sudden started having a hard time with the flow of my milk.

He will gag, gulp, stop breathing etc...

I am using my haakaa before every feeding to express about 2 ounces then he is fine.. the problem i have with this is i also have oversupply so i don’t want to put out more milk than i need.

He also has a bit of reflux which makes the situation even harder.

Has anyone gone through a similar situation and have any pointers?