Call Bell Tech support IMMEDIATELY. There is a problem that is now arising in the Bell Vibrants that some of the phones have an inherent flaw in the internal sdcard and once flashed to Froyo, whatever Froyo does to the card, causes it to fail. I have two co-workers that have lost their phones this weekend (I have not yet, knock on wood), and there are stories ALL OVER the 'net about others that have had their phones fail.
Your phone is DEAD and no amount of re-flashing, system restore, etc etc etc will bring it back. How Samsung and Bell will recover from this remains to be seen. Apparently, it does NOT affect the Telus or Rogers versions... no word on anyone in the USA having issues... yet... have they even gotten 2.2 yet?