I had the same misfortune, getting the wrong end of a ray in the foot- I was a kid, about 15 years old, camping in the midriff area of baja- let out some bad words that the whole "family" campsite was shocked to hear, but my friend's dad who took us there is a doctor, it was water as hot as I could stand, made it feel better till the water cooled, then repeat. Not fun, but chalk it up to a learning experience. If I remember, we whacked the tails, and grouper, it was worth it!