Increased sensitivity while trying to do NoFap is problematic

In my opinion, this does not count as a relapse as long as you can manage it and not using it as an excuse to act out sexually. I had this same thing happen before my last relapse, mostly when taking off my pants. I would get a rush from the contact and then an urge almost immediately after. It has gotten better with time (less sensitive, less tendency to fixate on that sensation when it does happen). Maybe consider some looser fitting clothing for a little while during the early stages.