Hello, I Have Had A Cough On And Off For

Hello, I have had a cough on and off for weeks (I teach school and kids come to school sick everyday!)with some congestion, sneezing, etc, A week ago I noticed the taste of blood in my mouth in the morning and when I spit, there was a pinkish tint and sometimes red. No blood in phlegm only when I spit occasionally. This scared me into quitting smoking. I am now tobacco free for 8 days but am scared and do not want to go to the doctor as I hate to go to the doctor. I am really stressed about this. I have no other symptoms.