Metalcrusher
A God Amongst The People
This is excellent advice. Particularly the air con and the exercise.
Can I add, if something is keeping you anxious keep a notebook with a pen beside your bed. Some people struggle to sleep because they feel like they are forgetting to do things - if that is you and you think of something write it down. Having the notebook beside you means you don't worry about thinking about X and then forgetting.
If you can, start thinking about meditation. I do it three times per day and it really helps centre your energy and your thinking. And I am not a vegan/hippie at all - the opposite. But if you learn to do it well you get an inner calmness that helps in all parts of your life.
For those needing mediation, there is no shame in it. Just make sure your GP monitors your dosage regularly and checks your blood pressure and does a full blood test every 6 months.
I advocate medicating as a very last resort though, but yes, some circumstances warrant it.