Approximately 10 Days Ago I Took A Viagra In The

Approximately 10 days ago I took a viagra in the morning on an empty stomach. Almost immediately I started feeling very lethargic, cold and my joints ached. My temperature actually got up over 101 degrees, I was flushed, my back & kidneys ached terribly and I had no strength. I took Tylenol and kept a cold compress on my head. The fever dropped and after a couple of days I quit aching. Now I have no strength, dry mouth and decrease in my appetite. In the past I have taken 1/2 of a viagra pill with no problems but it wasn't working as well. My doctor told me to try a whole pill but I had not eaten for 12 plus hours. Could I still be having lingering effects from this? I take no prescription medication other than the Viagra as needed.