The past in Yoga is no guide to the future. For what happened in the past was due to temporary and not permanent causes and to eliminate them is the very purpose of the sadhana.
At the Feet of The Mother
Sri Aurobindo to Dilip, Vol-1, 1929-1933
Shiva has a reason for all he does and a good (beneficent) reason even when one can’t make out what he is doing and why.
Don’t let troubles and difficulties depress you. The greater the difficulties the greater the victory hereafter.
In this Yoga the feeling of unity with others, love, universal joy and Ananda are an essential part of the liberation and perfection which are the aim of the sadhana.
You certainly need not be afraid of going into unconsciousness, for it is not unconsciousness that you would go into, but simply the inner consciousness.
Shakespeare was to the French classicists a drunken barbarian of genius; but his spontaneous exuberance has lifted him higher than their willed severity of classical perfection.
If the mind and the vital can feel and accept the soul’s sheer love for the Divine for His own sake, then the sadhana gets its full power and many difficulties disappear.
One cannot be in fully developed mental being even, if one has not control of the thoughts, is not their observer, judge and master.
Your question about Yoga bringing merely a feeling of Power without any result was really very strange. Who would be satisfied with such a meaningless hallucination and call it Power?