Mike, I'd bet lots and lots of money that you are simply going too fast. I experienced the same feelings when I first started swimming again. In fact, I felt like I couldn't even properly get a breath. But slow down significantly and get a song in your head to keep your ryhthm and you'll feel much much better. Once I started doing that I could put in much longer sets.
Currently I'm trying to get used to open water swimming. With no way to orient myself I think I'm swimming and extra half mile just zig zagging.
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