Dec 31, 1998 I wne to bed fine.  I got up the next morning and couldnt breathe.  I can breathe laying or setting, but not standing up straight.  Have had lung scan, xrays, breathing tests, stress test, etc. Everything normal.  What could the problem be?
Thanks for your question on Chat Doctor. I can understand your concern. No need to worry about major heart or lung related diseases as your all reports are normal. Sometimes, stress and anxiety can also cause breathlessness on only standing position. So consult psychiatrist and get done counselling sessions. Try to identify stressor in your life and start working on its solution. You may need anxiolytic Chat Doctor.  Don't worry, you will be alright. Avoid stress and tension, be relaxed and calm. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.