Well I guess I am back to square one. Despite the right heart cath readings that revealed a step up in oxygen saturation there is "nothing wrong with me". The bubble echo and heart MRI did not find the problem so one does not exist (so they tell me now). I just don't understand how invasive tests can show one thing but because the non-invasive test disagree the problem doesn't exist. Similarly, I was in the ER again yesterday with severe shortness of breath and chest pressure - nothing. I was even told the low blood pressure reading which caused the machine to alarm for 30 minutes was an inaccurate reading. The ER monitor tracked my BP at 103/34! Lately it has been dipping into the 90s over 40s in the evening while up and around cooking and eating and cleaning up after supper as well as watching TV. But my BP is not an issue. Lastly, video recorded readings of pulse oximetry showing o2 drops into 70s when walking is "not a problem". It makes no sense. How can so many different machines in so many different locations and scenarios catch issues yet there is no problem? No doctor has mentioned panic attack for me and I don't think that is the problem (especially with heart cath readings), but maybe it is all in my head. I don't really think so, but when you hit so many road blocks you can only begin to second guess your own sanity.