Can you do too many self breast exams in two weeks? My breast hurts, feels slightly warm and I have tingling under my armpit and down my arm.

The answer is: YES! You should only check your breast once a month, or
if you are in your reproductive age once in a cycle, always on the same day : Day 8 of your menstrual cycle every month and the 1st day of each month in menopause!!
See below. Without being able to ask you questions and examine you it's difficult to know why you are feeling your symptoms. Why were you doing so many self exams? Were you worried because you felt something unusual?. Doing frequent self exams shouldn't be harmful but may be unnecessary. If for no other reason but reassurance you should see a physician for an exam so you won't worry needlessly. Stay well.