Uncertainties, doubts and fears are natural to everyone until the Self is realised. They are inseparable from the ego, rather they are the ego.
If the ego goes they go with it. The ego is itself unreal. What is the ego? Enquire. The body is insentient and cannot say ‘I’ . The Self is pure consciousness and non-dual. It cannot say ‘I’ . No one says, ‘I’ in sleep. What is the ego then? It is something intermediate between the inert body and the Self. It has no locus standi. If sought for it vanishes like a non existent ghost.
You see, a man imagines that there is something (a ghost) by his side in darkness; it may be some dark object. If he looks closely the ghost is not to be seen, but some dark object which he could identify as a tree or a post, etc. If he does not look closely the ghost strikes terror in the person. All that is required is only to look closely and the ghost vanishes. The ghost was never there.
So also with the ego. It is an intangible link between the body and Pure Consciousness. It is not real. So long as one does not look closely it continues to give trouble. But when one looks for it, it is found not to exist.