I have a sedated hysteroscopy scheduled for next week to remove polyps. I’m so scared because I have asthma. I’ve been cleared, but is it still safe?

Should be. As long as the anesthesiologist knows of your medical history this should be a simple & safe procedure. There are anesthesia gasses that actually help stop a serious asthma event, although they have many others to choose from. I wuld not loose any sleep over this issue. .