Advice please

Hey so I'm going back to school in person soon. Because of a mix of a physical and mental issues I've been taking classes from home for a while. Before that, I was kind of open with my friends about being a system, but I've been having so much anxiety lately and I don't want them to bombard me with questions. I also don't want them to think I was faking if I shut down their questions and stuff. How should I handle this without being rude or sounding like I was faking?

Thank you