Three days ago, I was running - usually I run for two or three miles. I hadn't run in a week, due to an intense cold. However, I had to stop after a half mile due to a high heart rate, difficulty breathing, and sweating (none of which is normal). After these problems did not subside, I talked to a trainer, who said I was probably dehydrated and should eat. I purchased food, and forced myself to eat a minuscule bit of it - I had absolutely no appetite. This feeling was combined with light headedness, an inability to focus, and general feelings of anxiety.
When none of the symptoms stopped after three hours, I went to the ER. The ER ran an EKG, said they couldn't find anything and suggested that I was probably coming down with a cold. On the way home, I tried to eat a hamburger, but was only able to consume about half of it - with most of it me forcing myself to eat.
The next day, the symptoms continued. I had extreme head pressure, my stomach was suggesting that I wasn't hungry, and I could not concentrate in class. I went to the health center, which ran bloodwork and noted that my white blood cell count had dropped significantly from the night before. They suggested that I was anemic and had a stomach virus, which would explain the loss of appetite.
After sleeping for twelve hours, I still have no energy. I dragged myself to class, but had very little enthusiasm for actually going. I have had a constant head pain - mostly in the front and sides. My head also feels heavy, which makes concentration difficult. My stomach continues to bubble, even though I haven't had a significant meal in two days. I keep forcing myself to eat, but the food makes me feel nauseous. I feel extremely fatigued - getting tired walking across campus or up and down stairs.
I'm not sure if this is a stomach virus, symptoms of severe depression, or something else? I have been briefly treated for some depression and anxiety (never medically) in the past, but I have no reason to feel depressed at this moment.