Hocking blood and mucous in the morning?

So for the past couple years I wake up on most days with some crap in the back of my throat. I am pretty sure it is coming from my nose and not my lungs or throat. I dont cough it up, but i sort of hock a lougey and there is usually a little fresh or dry blood in it, or sometimes like a booger. The mucous can be a little green or sometimes brown as if i had an infection. I have been tested for hundreds of allergens but I am not allergic to any, yet I constantly have excess mucous in the back of my throat most likely from my nose. It can be quite annoying, and is always the worst in the morning. I do not smoke although i used to smoke one or two cigarettes a week in the past. Anyone know what this is and how I can avoid it?