Hot tubs make me feel kinda sick after about 5-10 minutes.
I completely agree. I've only been in a hot tub once in my life. I got out within 5 minutes, as I overheated very easily. While I like my showers HOT, I dislike immersing myself in hot water. Baths are also usually a no for me...
If you can't personally control the temperature, then I agree. I've been in one where I had to keep getting out or I'd start to feel nauseated, and it was awful.

I've also been in one that was delightful, with air jets, room to bob around, and just relax in. They can be wonderful or they can be icky. No question.