Thank you guys! I always think, what if I'm just one of those 1%.. anyway, I am much calmer about it now, you are right, it was probably just muscular. No, I don't have any underlying medical history, at least not thay I know of. I had an EKG and blood test when I freaked out 5 months ago and all was okay. I never feel really sure though since my doctor kind of haulted my tests. I complained of a fast heart rate out of nowhere, and she said she wanted a holter and event monitor just to be sure I didnt have a tachycardia. Well, I was supposed to have that months ago, but they kept cancelling and forgetting about us. So now it's still not done and I feel incompletely checked. My mom said we would try to reschedule it next year if I still wanted to. The delay in testing has also made me unsure whether this is all really anxiety, since I havent been diagnosed with anxiety yet. Actually at this moment, I'm worried over blood clots again. Sigh. I got out of breath putting my shoes on this morning, then when we were leaving my relatives house I suddenly felt unwell while standing up for a while. I felt kind of like you do when you get too hot. Only it wasnt really hot. I went to say goodbye to a relative and I felt like I was about to pass out as I walked over to them. I felt so close to passing out I thought, oh no I'm going down.. but I closed my eyes and.opened them real quick, and kind of thought, oh no what was that? Then I rushed out to the cool outdoors and got in the car. I had some breathlessness on the ride home, but it may have been because I was thinking back to the other day when I had breathlessness. Now I am worried I have a blood clot because of that. If I had one wouldnt it be obvious, like a swollen spot on my thigh or something? I dont have that, just the symptoms I described earlier. Sorry that was such a long reply, I just felt like I needed to get that out. again, thank you for calming me. Sometimes I just need to be reminded how small the odds are.