You are not being oversensitive. These things are real for you and you deserve help as much as anyone else. I understand the feelings of thinking it's all in your head and that others have it worse, I feel the same way some times.

I'm glad you were able to talk to your partner. Having support makes things easier.

A friend of mine suddenly had symptoms appear and it turned out it was related to something she witnessed as a child. Maybe your subconcious is telling you that you haven't grieved your loss or dealt with the trauma and now it's time.

I like the broken leg analogy, it's true. Maybe all you need is talk therapy, and maybe medication. Keep an open mind and make sure you are as open as you can be with physicians and therapists. They can't help you without all the information.