Blood, blood everywhere

I just changed my site. By myself. To some of you, that might seem like no big deal, but to me, it's huge. I've only been back on a pump for about a week and a half, and this was the fourth site change I've had. I was on a pump in previous years, and it took me months before I could change my site myself, my mom always did it for me. This time, I decided I would put my new site in before I took my old one out, just in case I couldn't do it. I put my new one in with no problems at all, hooked it up, primed the cannula, and I was good to go- or so I thought. I took my old one out and BAM, blood everywhere. And by everywhere, I mean it squirted out, ran down my belly, got on my pants and eventually onto the floor. At first I was shocked, I didn't know what to do. I was home alone. I grabbed some tissues and put pressure on it, thinking it would stop bleeding soon. Wrong. It bled- the soak-through-a-tissue-in-seconds kind of bleeding, for at least five straight minutes. I kept thinking "next time I take the tissue off it will have stopped" but it just kept coming! Eventually it stopped, and yes, I survived. I had a pump before and I do not remember ever bleeding this much. Ever. Once the bleeding was down to a minimum I put a band-aid on it and noticed it was hard all over. I called my mom at work and she assured me it was from the bruising, not the insulin. Needless to say, it was quite an experience. I hope it never happens again but for some reason, I'm sure it will. Has anybody else had a similar experience? Am I alone on this one?