Symptoms and Effects on Vampires that Don't Feed

Some of the symptoms of (and personal problems caused by) not feeding may include: 

1. An increase in unconscious feeding

2. Experiencing a decrease in energy or becoming Lethargic

3. Experiencing a decrease in magical or psychic ability

4. Fatigue

5. Depression

6. Increased sensitivity to light and sound

7. Migraines

8. Increased cravings for psi energy or blood

9. Forgetfulness

10. Increased need for sleep and waking up tired after having slept

11. Insomnia

12. Decrease in willpower and motivation

13. Contracting illness easily

14. Severely decreased ability to concentrate on everyday tasks

15. Stress

16. Anxiety

17. Nightmares

18. Rapid fluctuations in mood

19. Unexplained aches and pains

20. Increased sensation of "vamping-out" or otherwise known as “the beast.”

These symptoms often increase in intensity and frequency the longer a Vampire goes without feeding. More often than not, the Vampire had suffered from some sort of unaccounted for physiological symptoms long before they awakened.

I also believe, as I've experienced, that any medical conditions a Vampire may have, that share these symptoms, can manifest much stronger than normal during times when feeding needs are ignored. This understanding\belief is simple common sense, in my opinion.

More information can be found here, through the Atlanta Vampire Alliance.