It sounds like you have an upper respiratory tract infection.It could be that your symptoms resolved and you got a second infection.It could be that you've got a bit of congestion or post nasal drip. You can treat this with a mucolytic agent that can help the body break down and clear the mucous.It could be that you've developed a bacterial infection that is taking longer to clear and may require some antibiotics.It is likely that these symptoms have nothing to do with your car accident.Given how long your symptoms have been going for, I'd suggest seeing your GP or PCP for further treatment options.
[25m 175lb 61] Post-Concussion Respiratory IssueI suffered a mild to severe concussion on Dec 10th after flipping my car. Jan 13th I began to get sick. I mention this because I know it affects the immune system.So, 1/13; It started with a sore throat & a lump by my adams apple. For the first week It progressed to wheezing, headaches, extreme fatigue and as much mucus and snot that the body can produce. By Jan 22nd I felt better, but the mucus and sinus pressure was still there. Today is Jan 28th. The past 4 days Ive had mucus that began as lime green color the first two days, and the past 2 days (including today) has been the color of an egg yolk. I also coughed up blood a little while ago today. I have never had a sickness last me this long. Not even covid. Im concerned. What should I do?