I'm 19, And the only risk factor I have is really smoking. my birthdays in two days and I should be really excited but I'm terrified I have a PE/DVT. In the past three months I've had four ddimers, three chest X-rays, four ekgs, and a ct scan about two weeks ago. I started having sharp pain in my calf that has traveled to behind my knee to up in my thigh and I have spasms in both of my legs. originally my first fear was a PE then it moved to an aortic aneurysm now it's back to PE and I'm so scared that whatever pain in my leg moved from the past two weeks into my lungs.. I went to the hospital two nights ago and they said I had a negative ddimer but I've read cases that people have had negative ddimers but still have had DVT or a PE and that scares me so badly that I'm going to just die randomly. I need reassurance or advice or anything.