I hope you and your snake make a full recovery. It takes a lot for you to relax again after an accident.
I would make a couple of proactive suggestions, for your piece of mind. I would suggest a fail safe thermostat. I always use one on a rack as it is so easy to move a probe. It would help in any case. I would place the failsafe probe in a different location. I use the top as it runs warmer than the rest. I have it set below a critical temp Personally mine is set to 100ºF as my room is cool anyway. Heat tape at 100º in my case produces 95º or so. This should prevent any reoccurrence.