Had an extreme headache that lasted a couple of days and had me taking a lot of naps. Backstory - I am a 25 year old male with a lower than normal testosterone level and turned to ed medication (Viagra). Took it for a while, but higher doses (100 mg - sometimes 200 mg(rarely)) for about 2 years. While I always felt the typical side effects of the drug, they would always pass and I would feel normal the next day or the day after. At one point I had a different experience. Symptoms - First around January My heart rate increased even when I wasn't on the drug and I would feel unwell while sitting at the computer. I found myself having to lie down to feel better. This wasn't constant but would happen from time to time. I visited a cardiologist but did not mention my use of Viagra. They did some tests (EEG and ultrasound) and said that my heart looked perfectly healthy, except for a slight elevation in heartbeat. Second - Around July - severe headache I started having headaches more frequently. One of these headaches stood out like none I had before. It was quite severe and didn't go away even though I didn't take the drug in a while. (the headache was kind of focused on the front left side) I would even feel a little unsteady on my feet one of the days. The headache left me frequently tired and a little different. For example, in my job. I am a researcher and writer and found it more difficult to carry out my duties. While I feel a little better since the severe headache, I still don't feel myself lately and am somewhat concerned if something happened to my overall health. I still have headaches from time to time and sometimes get an elevated heart rate (around 100-104) when simply sitting for a longer period of time. In addition to that, it has become difficult to take part in physical activity (hiking, running), as I would often find myself out of breath and my heart rate really high.