Grant, I really like this idea for relaxing you.
I think you need to try and learn how to relax, even at such a young age.
If you get a technique down that works for you, you will have it always to bring you a little peace.
As far as your throat and your stomach go, use the hot tea, it will soothe and help to thin down that mucous a little (if the mucous is still a problem) Instead of trying to swallow the mucous back try to spit it out.
Try to watch what you eat for a while, stay away from things that have tomatoes, chocolate, caffeine, acidic fruits, etc.
If you can manage to deal with helping your stomach and at the same time work on your stress level I think you will be much better off in the long run.
As far as the rest of your story goes, you have fallen into a whole pile of moms here.
We will listen and we will hear you.
My heart goes out to you and I hope you do well with all of this so keep the updates coming.