Fan was making a whirring sound and now it sounds like the fan isn't turning at all? Please help!

I've had this whirring noise on the fan for a couple of weeks, I've vacumed it as best I can without opening my imac up but the noise didnt stop (like a whirring clicking noise with the fan, like it was stuck on something). I've booked it in to be looked at in the Apple store on Monday (soonest appointment avaliable), but I've just switched it on and the fan clicked a couple of times and then went quiet? Am I safe to use my mac? WIll it overheat? I'm scared to use it because the fan doesnt sound like its running at all now ? I've got 5 photo sessions and a wedding to edit and I may cry! Any help or suggestions would be AMAZING! Thanks in advance!
Ps these are my mac details
iMac
21.5-inch, Mid 2011
Processor  2.8 GHz Intel Core i7
Memory  8 GB 1333 MHz DDR3
Graphics  AMD Radeon HD 6770M 512 MB
Software  Mac OS X Lion 10.7.5 (11G63)
Pps I'm a bit rubbish with tecnical things so sorry if this is something obvious!

Do 2-3 SMC resets and see if this takes care of the problem. If it does not then book an appointment with your local Apple Store to have it looked at by a Genius.
Instructions for the SMC reset are in https://discussions.apple.com/docs/DOC-3603

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