Nose bleed

Hi guys. I just got a nose bleed and completely started to hyperventilate.(spell?) I felt a trickle in my nose and thought that it was just a runny nose. Went to blow and the sight of red and not clear freaked me... It kept trickling for about five minutes and I wasn't really sure I remembered what to do for a bloody nose... My boyfreind made a little nose plug and told me to stop freakin' and lie down and relax. I feel whoosy now from the heavy breathing. Why would that happen? I stayed in the A/C pretty much all day and besides the Poison Ivy irratating me I felt great today. I usually don't drink caffine, but I had a big Dr. pepper and some nachos and then went outside to get some fresh air when I returned it started. This is worrying me ---has anyone else experienced this on TX? Could working to hard or thin blood or food or stress or stupid poison Ivy do this? I haven't gotten much sleep the past two days... I know you guys are not Dr.'s but I don't know who else to ask. I don't know any online Dr.'s    Thanks Guys hope you are all o. k. Sorry to use the post...