I am pretty sure I have had tingling on my crown. And sometimes there is a lot of activity there, it feels like, as energies are going in an out (the crown chakra is our main connection to the Divine, or higher concepts in general). It could be that you kind of 'signed up' to become more aware and spiritually active at this time, before you were born? - Not a doctor, so I cannot comment extensively on it being anything more physical. Obviously if you do start getting pins and needles anywhere else, problems with vision, or any paralysis, do go for a check up! And even if you are too worried now. And or google brain tumor symptoms....
You might also want to google - ascension symptoms, or the like. I e.g. had a few times that I would work on some energetic system of mine, like the Hara, or Kundalini, and end up with pain in my spine for two days after (felt like an energy system upgrade). But I have been meditating for years, so I rarely get worried about such symptoms. As for empaths being psychic too, that seems quite common. As empaths we are definitely clairsentient already.
As for hearing voices - I can communicate with voices in my head, if I want to. They are usually just too unreliable though, so mostly I suppress them. I have found that with any spiritual communication it is good to keep the same attitude as with listening to something humans might say - just because someone claims something, does not mean it is necessarily true. A general rule of thumb is that voices from 'good' sources will obey your free will, and leave, if you ask them to. Whereas voices from other sources may stick around . One has to then potentially call in on divine guides and protectors to get rid of them. (but it does not sound like that is your problem at the mo)
Being more at peace at night seems relatively common with most spiritual people and empath I know. I reckon it is because so many people are sleeping, and creating less stressed energies. I often feel more energized and at peace on weekends too, even if I am working.
Hope all that has put your mind a bit at rest.
I'm attaching a link to a blog of mine, that contains my so far gathered wisdom re empathy - http://empathcommunity.eliselebeau.com/goodenergyhealing/blog/1511/my-empath-experiences-and-empath-tools-for-healing