Don't be so quick to label your natural instincts that have been ingrained in humanity (gradually losing strength of these abilities) as a defect in your brain.  More than likely the spiritual feelings you were having originated more from your heart and less from conscious thought.

Being aware of the connections in the universe is a gift, not a curse.  You might be interested in the phenomenon of 'indigo children' and see if you make any more connections.

A spiritual awakening doesn't call for a diagnosis as it is completely subjective and no doctor will ever understand.  Perhaps the religion you could create with your experiences already exists in essence in every spiritual philosophy and religion. ;)

Are hallucinations, dreams and aura just nerological phenomena, or should e ake heed of them? What category do they fit into?

It boils down to a clash  of cultures / criteria.  In Western, pyschiatric terms you stand a good chance (if you are cauight!)of being labeled manic-depressive/bi-polar, and the more you feel connected to a Higher Being  - the more you will be regarded as  needing hospitalization or treatment.

In some Asian/African cultures, on the other hand,  you might well be regarded as a holy man might well have been on  lithium, sodium valproate. Venlfaxine or whatever had they lived today!].

In artistic terms, there's a mass of evidence to support the theory of a connection between creativity and"mental disorder" (Van Gogh and Hans Christian Andersen to name just two examples)",  and  that label could be applied to many contemporary writers, artists, musicians, bolggers and other "celebrities".

In my case I had a number of hallucinations involving voices, religious insights and divine guidance prior to being hospitalized in a delirium and severely depressed in 1996 To my good fortune - I was able to recollect and write about them subsequently.   [I had been to therapy with a Freudian psychiatrist several years before, and interestingly the same themes had come up repeatedly in my dreams]. 

Being of a supersititious, spiritual nature, I regard these episodes as 'communications' or 'warnings' , not did not happen by chance. I was not afraid of them [though I soon  learned not to talk to them with "normal" people]. And analysing them rationally helped me enormously later in charting a spiritual "road map" for myself.

To sum up - there  is no clear cut answer.  Perhaps there's a consistent and realizable message in aura that are not scientifically explicable, with all our intricate knowledge of the brain's workings.

The danger line is when delusions cause one to malfunction as a social being, collapse physically and mentally, become a burden on others and/or or even become dangerous to others. Otherwise , relax....

"insructed" to