Overactive letdown/fast flow?

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I have overactive letdown (I think) and then a very fast flow. So my baby chokes when feeding and pulls off and eventually stops early. And then, my breast will empty within only 5minutes (I've tested this theory with pumping and I'm dry after 5-6minutes with only ~2oz output total). 
I'm on the verge of giving up EBF and going to exclusive pumping bc feedings are horrible- he's choking on milk and then empties the breast, which clearly isn't enough food for him as I am consistently  feeding him every 45min/1 hour. I'm exhausted. this isn't cluster feeding because it happens all day, everyday.  My son is 4 weeks.
Any advice?

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