Until you get in to see a psychiatrist there are a few things you can do on your own.

1. Set a consistant quiet/sleep time. Just go in your room at the same time each night with the lights off. Sleep if you can otherwise just chill in the dark quiet room.

2. Get up at the same time every day. This will also help with falling asleep.

3. Excersize. If you don't already do this just go out for a walk three days a week and work up to 5-7 days a week. It doesn't have to be a long walk. 15-20 minutes is a good start.

4. Healthy eating. It sounds like you are already working on this one so just do what your doctor suggested.

5. Read about mental health. The book I like that I keep recommending is "Why am I still depressed?" Which is about different types of Bipolar illness.