You went out and bought a kit, right? No wait your doctor told you? Negative and negative. There's a book out there called Eat Right 4 Your Blood Type. That's how I found out.
Reading about the foods for each blood type and honestly giving weight to the ones I like gave me an idea. When I got to how mental illness affects each blood type, it was easy.
The book also points out the importance of not stressing. It's better to relax and stay calm. It's paramount for your system. Good exercise and diet will take you a long way.