hi hope this dosen't offend you but do you have a weight problem? if so you really need to get it under control get that going it would do your whole body the world of good. but you could try apple cider vinegar as a coolent it should also help with the stinging. try cutting out any sodas even diet ones get off any fast and junk foods all of these are high in sugars and salt both are not doing your sweating any good. try this its a start. good luck
my skin sometimes burns from sweat where there is constant skin on skin. the affected areas are my privates the very top of my legs and under my boobs. it is intermittent but painful.