This all seems relatively normal to me. People don't feel much without a reason to feel an emotion, typically. Some people just find more reasons than others. Also, in general, people tend to be in a more emotional state when they are among others.
People get depressed and more "dark" when they are alone at length. Avoiding light will leave you with a hightened sensitivity to light, and it's possible you may just have a a sensitivity to it in the first place - especially if you have light colored eyes. You likely have insomnia because you sit there with your own thoughts too often,and it leaves you wide awake.
You and this woman likely have a connection - much in common. Such people often can relate, and finish each other's thoughts. This is not uncommon.
Not of these traits necessarily have anything to do with psi vampires. Psi vampires drain energy from others and believe they must do so to sustain themselves, though in my opinion the necessity of it is definitely not there. It is usually the result of some sort of emotional imbalance that they have not been able to correct, or are unwilling to correct as they become more attached to the idea of being a psychic vampire. There are no other traits or qualifications to being one.