I am wondering if anyone has the same problem as myself. I am bringing up a lot of phlem it is clear but thick at times and I get very breathless. It is really getting me down, as even when I drink or eat it comes up in mouthfulls. Some days it almost constant and at night I have to sleep elevated as it feels as if it is laying on my lungs. I recently had to go into the ER as I could not get my breath. The doctor said that my oxygen levels were fine and he thinks that it is acid reflux that is causing this phlem. He has referred me to see a Gastroendrologist that deals with acid reflux to see if she can find out where this think phlem is coming from. I also suffer from a Hiatus Hernia and I do not know if this is aggravating it. I would appreciate any advice anyone can give me, as it is making me feel very depressed.