Glad to hear you came away relatively unscathed Blitz! Not a good experience but one that you will definitely learn from.
As they say, there are two types of riders - those that have dropped their bikes and those that haven't yet.
I don't know if you have had any experience with riding offroad but I have personally found my motocross experience invaluable when encountering a few squirly moments on wet greasy roads. If it is possible, try to enroll on a motocross experience day (I know a track local to me that gives tuition, bike hire and safety equipment hire for £60 per day). You will learn to control a bike with your hips when it starts to squirm beneath you and realise what angles you can put your bike at and still ride away without dropping it.
I am not saying it is going to suddenly make you a fantastic wet weather rider but it may help build your confidence.
(plus you get to whizz around a track on a dirt bike....
)