Given your location I would suggest a trip to Kemble and do the stall/spin course at UH, this will definitely teach you that both are nothing to be frightened of if you know what to do, will teach you how to recover from and avoid both and ensure that you can stall without getting into a spin.
Edited to say that seeing you are still doing your licence, try and do this with your instructor, much of the posts below give reasonable guidance. As Ghengis says lower down, doubt if it is actually a spin being a Cessna, but if you do a spin lesson learning both that and spiral dive, see the difference and how to recover from both you should get over your fears.
Last edited by foxmoth; 4th Aug 2012 at 15:42.