Have you ever been so happy before that you can't help but feel scared, because you know a "crash" is inevitable?

I've learned throughout the years to relish in the moment and not let fear diminish the joys of today because of an imaginary future that may not come.

I think a positive outlook is always key. As long you brace yourself for mistakes to happen here and there, it should feel pretty normal I think.

Yes, it seems perfectly normal to feel this way. After all we all know that nothing lasts for too long and change is the only constant.

It's normal but don't let that kill the happiness you are having or can have. Keep in mind that 'nothing lasts so enjoy while you can'

Yes, I think this is normal. It's human nature to "wait for the other shoe to drop" because nothing lasts for long, good or bad.

You're on your way to complete happiness. http://www.bbc.com/travel/story/20150408-bhutans-dark-secret-to-happiness

Live for the moment and treasure the moment. Life is short. We should enjoy and live life to the fullest.

Find hobbies, play a sport, or do some yoga to relax. You can't work like a automaton for long.

as they say good things dont last but I would think too much about it. Waste of energy

Yes many a times...almost every time when ever am super happy...