For a week now I've had an issue where I can't breathe in deep due to some pain I get in my right lung around my back near the ribs. I'm unable to yawn properly or sneeze because of it. Now only recently, about two days ago, I've been waking up with a weird taste in the back of my mouth that usually wanes throughout the day and whenever I cough I can taste it. Just today I noticed taking a deep breath doesn't hurt as much as it did last week but now whenever I inhale deeply that same odd taste comes back as I exhale. I haven't noticed anything peculiar whenever I spit, no blood or excess mucus or anything. Just a rather foul taste.
Any ideas what this could be?