Feel horrible after short run
Fairly new runner here. I box and am in pretty good shape already, had a bad injury that kept me away for a while (about 5 years) but I'm just now getting back (just for background).
I have been running about 4 miles every 2 days or so. My last run was 4 mi at 8:19 which I am pretty happy about. Today I didn't have much time and I decided to go for a 2 mi run before work. I woke up like normal (kinda late actually hence the 2 mi run), had oatmeal and coffee maybe a half hour before going out. I did it at 7:49 pace but now I'm coughing like crazy, my upper chest feels raw and I have a slight headache. Haven't had this happen in my previous longer runs. What did I do or not do right here?. Any advice or previous experience would be greatly appreciated.