It's just the spiritual dimension of life that you accessed for a period, your ancestors were familiar with it,it's only since the recent age of reason and dominance of left brained thinking over the right,that visions,symbols and the spiritual became irrelevant and discounted,they are the sumpreme avenue of the right hemisphere of the brain and the soul.

The paranoid thoughts are from lower or bad spirits who use fear to enslave you.
In ancient times across all cultures and in tribal cultures still today they had effective systems and ways of dealing with bad spirits but we no longer have them today.