I really don't remember how it felt when the time pause started, but for the time travel I was able to. It's kind of hard to explain, the best description I can give is that it felt like the feeling I get when I am doing things that require a fair bit of brain activity, but this was much, much stronger, and then after that I could tell something happened. (I had flushed the toilet on full flush which normally takes about ~20-30 seconds, then with the 'time leap' it stopped suddenly after 3 seconds, it was full, and the toilet makes a sound that will always fade out.) I know I didn't black out because I have never had that before that and I haven't had that since.
As for the time pause, it happened when I was younger (At school in Year 8), I had thrown a pen at someone and they threw it back, I had braced for the impact but the pen never hit me, I looked up and found the person who threw it back was standing there doing nothing and the pen was floating and rotating slowly in mid air, I look around and everyone in my class was frozen solid, everything outside was the same as well. The one thing I remember as being odd was I had put my ruler up to deflect the impact and time went back to normal and the pen bounced off the ruler. I'm guessing that this has something to do with my subconscious, which would also explain while I haven't been able to do any of these since.