I keep getting colds then once its gone I feel I have mucus in my chest cause I feel clogged up and I hack up this to get it out and its a yellow/green phlegm with 2 small streaks of blood. I had this in Jan and it was an infection and I was on antibiotics. But antibiotics makes me depressed and anxious. I'm trying to get an appointment with the doctor this afternoon but I'm so scared I have something seriously wrong. If its an infection again its so difficult for me To go on antibiotics cause I'm breastfeeding and I'm allergic to a couple of them. Since my baby was born I have had 4 lots of antibiotics so don't want to take anymore. Does it sound like something serious?