Alright,

this Wikipedia entry is a good start on the neuroscience and chemistry that goes on inside our brains when love happens:
http://en.wikipedia.org/wiki/Biological_basis_of_love

As for the chemistry of conciousness, I'd recommend the book Neurochemistry of Consciousness: Neurotransmitters in Mind. I believe it's a free download on most readers. It's also a neat read.

It is exciting that we are those things. Because we all have roughly the same physical materials in our head, and we are all different people. The majority of us have the ability to record, interpret and recall information and stimulation, and it's all those chemicals and receptors in our heads.

We fall in love, or hate, or feel "meh" about something because of the stuff in our brain that makes our personalities. Even identical twins are still different people. That's amazing to me. The fact that we even reproduce at all, it takes a lot of work on a cellular level to even have a kid. That is amazing to me.

I have yet to see any proof that this is a god or a soul. What we can do is, look inside someone's brain and measure what's happening and what reactions we have. We can see it, we can observe and form conclusions from it.

We know that if you give a type I diabetic insulin, that insulin will act as a replacement inside their body. We also know, from the news, that if you try and think positive about getting that pancreas to work again, it fails to do so.

So, when someone says, that spirituality can cure disease, all I ask for his some hard proof. Not a bunch of hokem.