Leec,
I definitely and absolutely understand how much a lack of sleep can affect your life. I have had insomnia all my life and when it is bad, depression sets in. My dr has told me that getting enough sleep is as important as eating well and exercising. It can also be extremely elusive.
Continue to try to take care of yourself. Try Sleepytime Tea, sometimes valerian works for people, B vitamins can help. Above all, have faith that you can sleep and that things will improve.