Capsizing in heavy winds presents new problems in righting since the tramp acts like a sail and the pressure won't let you right it easily. Try swimming to the bow and holding on while in the water creating drag, and using the wind pressure on the tramp to push the stern out of the wind.
Also, beware of turtling in heavy winds, since the pressure on the tramp is known to cause the mast to go under. It happened to me, so I decided to pull up the mast to windward, but this time the wind pressure on the tramp actually righted (!) the boat with very little effort, and my crew and I had to grab the tramp and windward hull to keep the boat from capsizing again.