Obviously, if you can, you'll want your doc to explain to your director that you aren't contagious. If your director is still being difficult - even after you explain that you need to stay in college to maintain your insurance - then you need to check exactly the terms of your enrollment and find out whether they are legally able to ask you to leave based on an (irrational) fear of contagion. There may be legal limits on how they treat students - it's possible that unless they have a legit medical basis for doing so, they can't ask you to take time off. So you should look into that.
no subject
Obviously, if you can, you'll want your doc to explain to your director that you aren't contagious. If your director is still being difficult - even after you explain that you need to stay in college to maintain your insurance - then you need to check exactly the terms of your enrollment and find out whether they are legally able to ask you to leave based on an (irrational) fear of contagion. There may be legal limits on how they treat students - it's possible that unless they have a legit medical basis for doing so, they can't ask you to take time off. So you should look into that.