You're surrounded by medical professionals who all know that you just had surgery and now you're running a low fever. If there was anything to worry about, they would be worrying about it.
They have already given you Tylenol which is the first line of defense. It's very probable that your fever is already down. As you are checked during the night, you can ask and I'm positive that your fever will disappear. But I think you could make things a little bit more difficult if you are excessively worried or panicked. You don't have anything to panic about right now. It's not like out of millions of people, you're the one who contracts a fever as a post-operative condition and you die!
If you're still hooked up to that morphine pump, push the button and let yourself relax. If you find yourself feeling more panicky regardless, ask the nurse for a sedative or something to help you sleep. They will be happy to give it to you.
But I'm guessing by the time you're reading this your fever is already down, having responded to the Tylenol. It's not a real fever that indicates some sort of illness. It is just a random elevation in your body temperature that could be due to stress or something you ate or wishing you were home or anything. We can work ourselves up into a fever pitch.
Give yourself a little dose of Happy, take some deep breaths and try to visualize a place where you feel very happy and let yourself Drift Off to Sleep. It's really great that you're in a hospital with this little fever. Nobody's going to let you get sick, that's for sure! They'll be waking you up all night to make sure that you're fever has gone down. You are feeling uncomfortable about a lot of things and the fever is just one of the ways that your body is telling you you don't feel good. A good night sleep will probably restore you to complete health.
You can actually regulate your body temperature with focused meditation. Imagine yourself in a beautiful Meadow with a Cool Breeze and butterflies everywhere, or next to a beautiful Crystal Clear Lake. Feel your environment touching your skin and enjoy it. You will help your body to relax as you allow your mind to relax. And when you're relaxed, you won't be feeling feverish.
You are fine.