Re: very angry at relative!
It sounds like she had a panic attack.
Parents are supposed to be supportive and listen to you, but as I learned with my own mother, sometimes there are things they just would rather not know. My mom is the worrying type, and she'd rather have her head in the sand and think everything is rainbows and lollipops instead of knowing about all of my little forays into darkness. Maybe your mother is the same way. Perhaps she isn't the best person to confess ALL of your bad feelings to.
The grass is always greener on the other side...until you get closer and see that it's astroturf~