Once you have the diagnosis, I really don't think it's worth shopping around unless as others mentioned you want to join a trial or perhaps you want more guidance on medication. I would suggest reading some of Dean Ornish's amazing research and just focus on lifestyle and diet.
That said, for those of us who have it in the family, the time to act is now-with diet and lifestyle and doing everything research suggests to stay mentally fit. Mental health is also a huge component. My parents did all the right things, but my mother especially always refused to stick with psychological intervention and the woman lived in a constant state of hysteria, extreme anxiety or anger with some periods of happiness here and there. She ate healthy and exercised her mind and body, but she definitely had the personality type I read is more prone.