I can't answer either the disqualification question , or indeed the life threatening one, if you are concerned you should exhaust all possibilities with your designated medical aviation examiner.
100 could be quite normal in certain circumstances , for example I'm 42 (ignore the profile) and normally at rest is 56, yet a recent class 1 renewal sent my "at rest" up to 67, when I train for fitness I average 140 , peak at 180+ and recover at 105 , so everyone is different.
I suggest you see a medical examiner, and explain your concerns up front and make sure they are aware of your "nervous-ness", everyone suffers from "white-coat-itis" at some stage or other.........
