Hi, I have recently been having these random coughs that come on out of nowhere, 1 to 3 at a time when it hits usually, for the last few days. This is accompanied by what feels like a sudden mucus build up in my throat. When I go to clear my throat and spit up, it's usually clear and light like a grouping of saliva. I just noticed, a moment ago, a very small brown like substance in my last spit up after I work up from sleep with a cough and slight chest pain.

I have recently come off having a partial flu about a week and a half ago (only lasted two days), but I also take three medications for blood pressure (which it has been mostly normal since taking them, and I have been taking them for a few months now). I do however have some moments of chest pain and headaches, though I don't know if that is my anxiety and/or GERD I was previously diagnosed with prior to my last doctor discovering my unstable blood pressure. I don't feel any heartburn, so I'm not sure. Whenever I do feel pain in my chest it's usually right below my left breast or top center of my chest, right below the collar bone. When I have headaches, it feels like its on the top left side every time with it sometimes radiating to the left side of my forehead and temple.

I know this may be several problems and not just one, but I am getting a little nervous. I unfortunately lost my job recently and have a two month old son. I don't think about it, but I'm a little worried it is something life threatening, but again, I'm not sure if that is the anxiety or not. I have not had any heart attacks, last tests I've had done in January stated I was okay outside of the blood pressure, but was told it was getting better and that it had become stable enough to exercise.

I guess my question or questions rather, are:

1) What could this cough and mucus be?
2) Should I be concerned about this single instance of brown stuff in my spit up?
3) Could all the things I'm feeling and showing right now be a sign of something more worrisome even though I've been told that I am getting better?
4) What actions should I take to resolve all of these issues?

Sorry for the long list, but I really want a second opinion about what I'm experiencing.