It's proper f**ked me over, been driving around and just feel unsafe
Time, and getting used to the road will having you feeling competent again. Definitely looking into some advanced training could help, it might even bring your insurance down a little.
A good percentage of us have binned a car at some point, I know what you mean by it leaving you uneasy. A friend of mine was driving too fast for the conditions and plowed a Zafira through a fence, all the way along a wide bend. Posts shot through the windscreen and doors and missed his and his passengers face by inches - the photos looked like something from Final Destination. He did an advanced driving course and had plenty of practice until he felt like he was ready to rejoin the traffic.
Hopefully while poorer for the loss of the car - you're richer for the experience of the crash!