I tore mine when I was young in a "freak cheerleading accident" It was really bad and I could barely walk. I understood how it could cause someone to end an athletic career. It took me a long time to get back to normal with it, and I do think I pull that hamstring easier than others, and sometimes after riding for a long time I find some problems with that leg (though only after riding, not that much while riding). Not sure how helpful that is, since like I said - MANY years ago, and sounds like my problem may have been different since I knew the moment it happened.

Good luck. It stinks when you can't do anything other than core/upper body stuff. Hope you are on the mend soon and riding without any trouble!