Angelia

As an interim measure so you can go back to school teaching, consider getting a "spit bucket". It can be as inconspicuous as
one of those ubiquitous large coffee travel mugs or as obvious as what I used: a cylindrical igloo cooler. In either event, you just clear your mucous with a rinse ( I used seltzer water with great results) and spit into the container. Amazing how clear you will sound without the mucous.
Charm