How do you get diagnosed? You see a psychiatrist. Maybe your GP can, but a psychiatrist definitely can, that's his/her area of expertise besides writing prescriptions.
Before diagnosis you deal with being bipolar one minute at a time. You cope the best way that you can. If you're feeling impulsive, you remove the temptations; like money, gambling, etc. You get yourself away from any temptations and stay away until the impulse stops. If you have to, go stay with someone who will help you not to give in to any vices. Give them control over your money just for awhile IF they are someone you can trust. Check out the website bipolarsupport.org. There isn't a bipolar community here.
How do you vent your anger? How about a real punching bag? Set one up in your garage or home or apartment? Use it only during reasonable hours if it's in an apartment? Try punching pillows on the bed? Swim laps for 45 minutes? Run at least a few miles at a steady pace and sprint at the end?
I don't have any ideas for your rest, but I would ask the doctor when you go to see the psychiatrist. S/he can prescribe an antidepressant that will make you very sleepy and may help. Please make an appointment asap because it can take awhile to get in. Ask around for referrals to a psychiatrist. Look at the photos on Psychology Today's website. You can read about doctors and therapist's philosophies, specialties, education, fees, insurance accepted and so on. This list won't be complete.
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Does this sound like bipolar
Waking up with anxiety 
I stared at myself in the mirror
New 
