Sorry about your problems. Insomnia is just awful. I used to suffer from this. I was diagnosed with depression, I took the prescribed pills and the result was lighter insomnia with vivid dreams that made me wake up. So in the end it was the same.

I got frustrated and started wondering why the usual therapy doesn't work for me. I also stopped the therapy and the pills. Now 5 years later I feel better, but I can't claim that what I did would work for you. It just really depends. It also depends how severe your problems are. Mine were severe at first (not the insomnia, but the depression), but after about 6 months therapy I felt better. Good enough to start on my own.

I personally started reading about serotonin and dopamine because those are the neurotransmitters that have impact on the sleeping patterns. I was on SSRI before and it didn't have any positive effect on me. Like none. I asked myself why. And I found out the answer for myself. I obviously didn't have enough tryptophan to synthesize enough serotonin. So no matter how much this serotonin would stay in my brain there will be no results because I just simply don't have it.

So I implemented changes in my diet and routine to help this out. I removed the fast carbs (like chocolate, cakes, candy bars) because serotonin depends on the insulin levels and once the insulin is low the serotonin is too. And my insulin gets low pretty fast after eating of such foods. Yes it gets higher first, but then rapidly goes down and 30 minutes I'm hungry again. As you could guess I have this carb hunger that caused me in the end to gain weight.

Anyway back to the Insomnia. This is what I did and I could totally say that right now I go to bed around 10 pm and I wake up 5:30 without problems. I'm not sleepy at all and if I do wake up during the night it's because it's too hot right now, not because of the insomnia.
1. Like I said changes in my nutrition - I totally removed the fast carbs and replaced them with fruits, dried fruits and nuts (love me some raw nuts, they are good for the brain and the serotonin as well). I don't drink coffee, but if you do you could try do it only in the morning or remove it. I drink teas now - Roiboos particularly is really good tea that is even recommended for depressions and such.
2. Having diary helped me too. Whenever I'm frustrated over something I write it down to the diary. I don't even need to share it with someone. It's just important that is there and I wrote it.
3. At first I still needed about an hour to fall asleep. And not being able to fall asleep right away is quite frustrating. So I started thinking/dreaming about something super farfetched. It was like writing my own story where I'm the main character. At some point I usually was exhausted enough to fall asleep.
4. Having sleep regime is always helpful. No matter if it's weekend or week day I try to wake up and go to bed in the same time. Otherwise it's chaos and my body does whatever it wants and it's not what I want.

Have you had before manic episode? Mine are usually no longer than 2 weeks luckily for me. Then I have the insomnia, but it's not that bad. During manic episode I just don't need sleep at all so I try to drain myself as much as possible and this way I will want to sleep to get my energy back.

I hope that soon you will be back on track.