tingling during arousal

Hi. I'm a 26 yr old male (27 in a couple days). I'm generally healthy and active, and I've not been diagnosed with any diseases. I had a scary experience earlier tonight, and I just wanted to ask someone about it. It came about during a sexual situation...

I was fooling around with my girl (nothing out of the ordinary). As I got more excited, my fingers began to tingle abnormally (started in the pinkies of both hands and spread slightly to the ring fingers), and my hands felt tight, nearly closed into fists while I relaxed them. This tightness also occurred in my lips; they felt pursed and I couldn't open them as wide as I could just minutes before. I was also having considerable difficulty achieving and maintaining an erection. After some very direct stimulation, I was able to get some erectile function back, but I came to orgasm in about a minute, which is VERY premature for me. The climax was also rather unsatisfactory, but I was too afraid of what was happening to me to even think about keeping the excitement going.

Following climax, the tingling and tightness in my fingers and face subsided slowly, and I was back to normal within 10-15 minutes. Though quite disturbed about the strange symptoms, and with my uncharacteristically poor performance.

Any ideas about what happened here? I've heard that erectile issues (especially for someone of my age) can be signs of other medical conditions. Last week, I also had erectile troubles (minus all the other symptoms). I thought all I'd need was a few days rest, and I'd be back to normal, but - as you can see - it's only gotten alarmingly worse.

Thanks for taking the time to review my situation.

Regards,
-- Mickey