I am experiencing thick saliva or mucus in the back of my mouth where the wall of the throat is. it's been going on for 2 months, no coughing, no colds, just yellow mucus which could possibly the reason why i have yellow snot (not wet) in my nose.

Allergies.: That sounds like allergies. Nasal congestion, runny nose, cough, post-nasal drop, headache, facial pains and earache can be triggered by fragrances, dust mites (sweeping the floor), grass, trees, pets, environmental molds and such. There are outdoor and indoor allergens. See a doctor soon, here or locally, as there are medications that may help.