I passed out in my colleague's office. For a while now, when I laugh or cough too hard, I get lightheaded. It's been getting worse over the last three months. Yesterday I was laughing at a dumb thing actually, a missing entry in a database, and then I was getting up off the floor and asking Brad why he was on the phone. He was calling 911--I was out for 30 seconds or so. Strange. Brad stopped dialing since I was up on my feet, but I went to the doctor last night. The doctor said I seem to have a heart murmur I've never had before. The EKG turned out OK, but I have to get an ECG(?). And an ultrasound for my carotid arteries. I may have to wear a halter monitor to see what happens when I cough or laugh. It could be a nerve along my diaphragm that is compressed when I laugh and drops my heart rate. I guess I'll know more next week.