I had a similar problem,only to find out i had an umbilical hernia,i am not saying it's a hernia, but the symptoms relate to what i had. i wish you luck on further tests.
Hi and thanks for using the forum.
It is not unusual (especially if you are thin) to be able to see a pulse in your stomach when you are lying down. It would be unlikely that you have an abdominal aortic aneurysm since you just underwent testing in the ER and everything turned up negative. I think that you are OK to wait for your scheduled appointment. However, if the pain gets worse, or you develop other symptoms, you should be seen sooner if possible or go back to the ER. Good luck.
Bridget