Fainting Fright

I had a scary morning. Last night I took some decongestant and sleep aid pain pills, which may or may not have contributed to my morning. When I woke up, I felt normal until I got in the shower and started rinsing the shampoo out of my hair. My vision started blacking out. I sat down and felt better. I stood back up and almost immediately I completely lost my vision. Blackout. I quickly rinsed the rest of my hair and got out of the shower. I laid on the closet floor for an unknown number of minutes, then quickly got dressed. I felt horrible whenever I was standing up, but I made it in to work anyway. Things got progressively better as the day wore on, especially after I got over my nausea enough to get some food in my stomach. I talked to a nurse and got an appointment for Friday to do some blood work, but the nurse seemed pretty confident that as long as I'm feeling better, I'll be okay. I guess it's not all that uncommon for fainting spells to happen to people during morning showers, especially when the water's too hot. It was freaky.