Shedding wouldn't have anything to do with a regurg. Low temps, stress, too much handling in the first 48 hours of eating, bad gut flora, illness...these will cause regurgitation.
Double check your temperatures, even change the batteries of your temp gun/digital thermometer if you had them for a long time, (low batteries may lessen the accuracy of the measurement). I wouldn't offer any more food till at least after he sheds. Give him something small, like a pinky rat, or fuzzy (about half the size you would normally feed, as I can't remember how big your snake is at the moment).
Check his water dish for any signs of drowned mites. A heavy mite infection could cause health issues as well, which may have lead to the regurg. Staying in water instead of being in a warm spot (maybe warm spot or cage in general is too hot and your snake is desperately trying to stay cool) won't allow for proper digestion either.
For the most part soaking in the water dish is fine, but if its done constantly, it can cause blistering of the skin and scale rot. Make sure the humidity in the cage is good as well, or provide a couple moist hides, till he sheds.
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PHLdyPayne