Wytch, try eating some good carbs like chickpeas to help raise your blood sugar. Make sure you are drinking TONS of water...being dehydrated makes you sleepy and caffeine makes you dehydrated. Try not to have more than 2 servings of caffeine a day or it affects your weightloss.
Have you talked with your pyschiatrist about sleeping pills to help you get over the insomnia? Mine gave me a very low dose of Sonata until I got back to my regular sleeping patterns (I had the same problem you have), and it worked like a charm. I only had to take the for about a week or two and I was back on track. Haven't had much of a problem since. Now I take a small amount of Remeron to ensure I get to sleep. Do talk with your doc...sleep is so essential to everything, including weight loss!!!