Does this happen often, or is this the only time it happened? Because life is never the same all the time. It sounds like you were just a bit tired.
How do you know your body temperature was elevated? Because you felt cold in an air conditioned room when you were not running? Or did you actually measure your temperature.
As someone who runs frequently, what you are describing - an elevated heart rate hours after finishing a run, is more comparable to when I run very hard efforts, for me that would be an hour of 1 minute "fast" 1 minute "slow" intervals, where my heart rate is elevated to the mid 160s when most of my runs it is in the 130s and 140s (what the heart rate is doesn't matter, what matters is I'm pushing harder than normal). Both my heart rate and blood pressure take hours to come back down. I don't do this type of workout that often, for running I need both lots of long, easy paced runs and every so often a faster paced workout.
What is going on here? In my case, this is probably "oxygen debt". When I do faster paced workouts, my muscles aren't getting oxygen fast enough and my body starts producing energy by an anaerobic pathway, which produces lactic acid. This lactic acid must then be cleared from the muscles after the run, which requires more oxygen that what would normally be used in this clearing process. You might find yourself breathing heavier, and having a higher heart rate for some time period after the run. According to one website, it should take 1 hour to clear lactic acid with active cool down exercise, or 2 hours or more if you don't warm down with gentle exercise.
Signs of heat stroke or heat exhaustion while running (for me): I start to get dizzy. I stop sweating. My heart rate spikes and is at a much higher rate than the pace I'm running at. If those things happen, usually on very hot days (we're talking full sun, mid to high 80s, usually 29 deg C or higher), I will call for someone to come pick me up. I usually bring water (and electrolytes if it is hot), and can frequently last for 2 hours or more in this type of heat, but sometimes I can't. Heat exhaustion is something you would probably notice was going on at the time, and hopefully take seriously.
Why don't you feel the oxygen debt when it is happening? Well if you are anything like me, you enjoy running and the rush of adrenaline while running will cause you not to feel pain that you might otherwise feel. It also constricts blood vessels to some parts of your body and directs blood flow to your large muscle groups to aid the flight or fight response. Endorphins generated running can also help you ignore and pain or problems your body might be feeling at the time.
So... do you feel this way on every run? And if so, are you running every run at the same pace, where it would be difficult to hold a conversation or comfortably maintain for hours at a time? I don't think experiencing "oxygen debt" is a bad thing after a particularly tough workout. But, if this is something you are encountering after every run, I recommend reading about different types of training. Many training suggest doing the majority (80%) of your runs at an easy pace to build up endurance, and only 20% or less at a faster pace where you'd be generating lactic acid.
As for heat exhaustion tips --- I ran a marathon last year in 85 deg weather (29 deg C and up), while apparently anemic although I didn't know it at the time. As soon as I started feeling dizzy (about 15.5 miles in), I switched to a run-walk strategy. I drank lots of water and electrolytes. I felt fine after finishing, because I was keeping my heart rate in a lower range. (I felt much better after that marathon than the previous one which was in the 50s which is around 10 deg C. The hotter it is outside, the slower you need to run to maintain a lower heart rate. It doesn't mean you can't run fast in the heat, I just don't recommend doing that every day.
It may be because you start exercising after some time and you got fat and your body does not like this type of routine that's why it's showing some affects it is positive but if you are regular then if it does not go too high and you catch up after some time than it is not a problem but if unbearable than you should avoid doing too much cardio or take your body fitness slowly toward your aims love the process it's going to take some time you will get it some day .
have a nice day spread peace.