Underwater Insect Bites???

[me_and_myboy]

I would agree that this is swimmer's itch. It is a parasite that leaves it's snail host and migrates up to the water's surface and waits for a host. Since you had such a reaction to these bites, it is safe to assume that you have had previous exposure. Treatment is typically symptomatic relief via topical antihistamines (Benedryl) or corticosteriods (hydrocortisone cream).
Seek medical consult if you develop diarrhea, fever, or nausea.

Wear your waders.
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