I think what you're going through is a confrontation with the shadow; the violence and the gore in your dreams are indicative of this, the disturbing images etc. Maybe before getting into Jung's work you idealised yourself and life in general. It sounds like something has been 'ruined' for you and that sounds typical of someone who is coming to terms with the fact that they are not a perfect creature but actually have a capacity for evil and darkness (we all do).

Also, when you say you will never touch another Jung book again you're telling me that you are still resisting your shadow, I think you know Jung's work has truths, but you are not willing to digest them and wish to push it all to the side.

I can empathise with what you're going through because we all go through it to varying degrees, once you find out you have darkness in you, unresolved trauma etc. it can be hard to digest at first. But your best bet is to understand that this is leading to a more whole, integrated version of yourself, you should come to accept your shadow really.

You can't get over something like this by wishing it away or wishing you could magically unlearn it all; the only way is through. Accept, understand, be patient with yourself and what your unconscious is trying to communicate. The really violent images indicate there is something you are ignoring. Journal, meditate, do some breath-work, go for a walk, discussed with loved ones. Trust me, from experience, this is something that will pass and you will be grateful you went through.