hi, im a 20 year old male and have never had a problem in my life until bout 3 months ago when i took viagra as a joke with my mates, stupidest thing ive ever done. 3 days later i went to hospital was getting all tingly and thought i was going to have a heart attack. They put me on the heart machine and that and everything was fine, gave me some valium and sent me home and said it would go away. 2 weeks later i was still getting tingles throughout my body and felt like ym heart was skipping a beat or something and couldnt sleep so i went back to the doctor, he checked me out again and said it must be anxiety. Gave me some drugs for that but still right now, im getting tingling toes, a headache and can like feel my heart beating or something and i have trouble sleeping at night and im so sick of it. what the hell is happening?