For about three weeks now towards evening and at nights i feel at times snuffy nose at times drainage from nose,itchy,burning throat,almost as if something is in it at times.And then every morning find myself blowing my nose and coughing up alot of flem. And pain on my right side midway down my back. But that pain started about a year ago,doctors say they dont know what it is after alot of test showed nothing. Whats wrong with me?