Ways to get to sleep

I know a lot of people on here struggle with insomnia and so I just wanted to ask a few questions about it see if anyone can help me

First of all, does it get worse for any of you when going through times of change? Whenever I start a new job or have some other change in my life it becomes unbearable. I just cant sleep no matter how tired I am or what techniques I try and my head drives me mad imagining things and being anxious while I am awake

Secondly, what techniques have you guys found works to help with insomnia? Like routines before bed, sleeping medicine, anything? 

Really cant carry on like this every night