TorontoShave,
I'm assuming from your first post that you're around 19? If so there are certainly changes in the skin that follow the tail ends of puberty - oil levels, pH, hair thickening - any of which will throw your "usual" routine off. Changing your routine one factor at a time would certainly be the wisest choice. You might also consider changing your blades more often as you might be wearing them out more quickly nowadays.
There is another possibility that hasn't been mentioned: a rash. It could be something like fungi or perhaps you've developed an allergy to a product you use.
Either way, you might want to take a break from shaving for a while to let it heal, and then start fresh.