Fainted today

I fainted this morning :( At work :(( In my collegues office :(((

Yeah, it was pretty stressful! I got all worked up about a stitch (pain) in my side, that just wouldn't go away! I called my mom, thought maybe she could diagnose me, but she only made it worse; "Maybe it's a blood clot!" She said! OMG... [freaking out ensues!] I run to my collegues office and proceed to tell her the story and I feel it... the blood, rushing out of my head. *1,2,3... down for the count! I had fainted! When I came to, my collegue and another co-worker we standing in front of me, just staring at me! They weren't sure what to do... but I did, and I just slunk too the floor and laid there taking deep breaths till I calmed down. (which actually took a while!)
(ASIDE: Yes, I am a fainter! I have fainted from the sight of my own blood. I will faint if I talk about a medical condition pertaining to blood. Even the word "clot" [shudders] is not a good one to use too many times around me! (I know... I'm weird! )

So back to the fainting story... I'm fine now, from the fainting. Honestly, that part didn't even phase me. My issue is that I still don't know why this side stitch persists? Is it fitness related? Do I actually have a blood clot??? Or just a spazming muscle? The pain reminds me of a *growing pain* like I used to get as a teenager, you know the ones where it sorta hurts to take really deep breaths?
I have a DR. appointment this afternoon. I hope she doesn't think I'm a freak, if it turns out to be nothing! :(