On multiple occasions I've felt like I was so close to completely losing it.
One time was when I actually had an experience, a vision. I saw into the future for about a week, but the visions ranged from the near distant future to far distant.
I saw the ending of a strong friendship I had at the time, my grandmothers death, and the details of the ending of a relationship I had. It was all very strange to see everything in detail. Kinda cool to have "the sight" but not when you see mostly disaster.