You'll probably get more useful replies if you let everyone know what kind of experiences you're hoping to hear about. What drill nights involve? What chances you have of mobilisation? Whether your experience working in the NHS will benefit you in your TA career, or whether you'll have to start from scratch? What role you'll have within the AMS?
I'm not AMS so I can't offer any advice I'm afraid. However, if you do work for the NHS, you may like to try something different within the TA. Have a think about trying something new. Many people find doing something completely unrelated to their civvie career very refreshing!