Welcome Jeremy.
What you're going through is normal. I don't know if I had the mucus problem but I certainly had sore throats, sore tongue, sore gums, and all-over misery for quite a while when I first quit. I thought of it as my brain and body being in shock from no nicotine all of a sudden.
You'll get through this. Just take it one day at a time. Your body and brain will fight you for a while but it gets so much better with time. The cravings slowly go away too.
Best wishes to you.
DeskJockey - Day 362 today