Good that you made it out ok. Sometimes you can stress your back/neck during these wild movements. If your forearm is sore, it may not be from holding the steering wheel, you may have stressed the nerves coming out of your spine - took me a year to find that out!
I also hate the OEM Goodyear RT/S tires on wet roads. Glad that my '11 has stability control! Will be getting winter tires in a couple of months and the Goodyears will at most stay on for one more summer...