Heat
Fever
Your womb spins in a circle and starts to boil with heat. Uh oh, I think you have a fever.
ねつ
あつ
None
The heat from your fever is making your insides and your head and your entire body spin and boil, until your doctor throws some nets (ねつ) around you. You were flailing around and they couldn't get you to stop, so they had to catch you in a series of nets.