Any tips to help me get to sleep at night?

I’ve got most of the symptoms of insomnia, but I’m not really willing to go to the doctor about it yet. I wanted to know if fellow jellies have any suggestions on how I can get to sleep easier. My situation has gotten really bad; I hardly fit in 3–4 hours a sleep per night and even then I toss and turn quite a lot. Often I go 2–3 days without sleeping at all… my body feels tired and exhausted, but I’m still unable to go to sleep properly.
Suggestions?