I'm like you, I sweat at the drop of a hat, so I can commiserate. A thin wool base layer can help, at least it works for me (I actually use a wool blend base layer from KUIU). And I agree with whoever recommended pacing your stop instead of stopping all at once, donning layers as you do - that could give your body a chance to regulate its temp. You could also, after donning your layers and stopping, do some jumping jacks. And definitely put a warm hat on as you slow to stop.