just dont play with your nips. little sensitivite isnt a big deal. you can run b6. i doubt it will do anything. are you running any ai right now. it really could be the hdrol or the tren. unless there is a lump i wouldnt worry about it. the more you touch your nips the more they will become inflamed and the more youll freak out.
you can stop if you want to, but it sounds like your not taking an ai.