Two weeks ago, I was doing chest voice warm-ups. I was doing that "bright ping" sound, trying to grow my chest voice/ passagio zone. And I started coughing. I may have been pushing to hard on the higher notes. I was also trying to see if I could get a "really bright" sound, like a kind of witchy sound. I'm not sure if this is what cause my problem, but my throat became ticklish and I started coughing.
After the coughing started getting worse, I began backing off the sound. But the coughing persisted, day after day. Every time I went to sing, I end up coughing, after a few minutes, especially when going for an open sound.
It's been going on for two weeks now. I took a day off yesterday, to see if it will go away. But this morning I went to warm up. After a few mins. the coughing came back. Not sure what to do. I probably shouldn't sing. I have a video, but I don't know where to upload it.