I really hope you're feeling a lot better by now. I see it's been a few hours since you posted.

I think that "Heat stroke" itself has an elevated core body temperature. It is potentially very dangerous. Heat stroke needs immediate treatment.

Heat related illness can also be exacerbated if we're taking particular medications when the weather is very hot and it's important to make sure you're hydrated well and take precautions so as not to overheat. e.g. cooling the body and checking colour of urine for dehydration etc.

Are you also taking any medications that would affect the way your body reacts to heat?

If you are taking any medications for your conditions then it'd be worthwhile checking them for heat related side effects. Ask your doctor about that as well.

How hot was the temperature when you were running and walking outside?