To get an accurate read on hypothermia, you need a rectal thermometer. Sorry, Ranger.
Hypothermia: condition where the body is unable to maintain core temperature.
Hypo has a compounding effect, in that once it starts, there is no stopping the downward slide. Except rewarming. I'm not a doctor, but have a very good working knowledge of hypo from my mountain rescue training, and a personal familiarity with the condition.
Here are the symptoms of hypothermia, from someone who has been hypothermic more than a few times in my life and nearly died once from it:
Slurring words, occasional shivering, advances into uncontrollable shivering. fuzzy reasoning, slow response times, bad decisions, functioning in a diminshed state, all come along with the onset of hypo.
The uncontrolled shivvering stops. A calm state of mind results, with confusion, false feeling of warmth, a desire to curl up and sleep, then the inability to move, passing into unconsiousness and eventually death if body continues to drop core temp.
I think you were probably okay!