Don't identify so much with physical or psychic phenomena. These impressions come and go. If we identify with a given sensation, physical or psychic, we lose our perception of things and snap ourselves out of the experience. The solution is to meditate and practice more. You must learn not to give so much attention to these things, because if there is identification, fear, tension, or any strong emotion, as subtle and imperceptible as it may be, we will wake ourselves before achieving conscious astral projections.
There is something keeping you attached or afraid in the mind to such phenomena. If you just observe and do not give the impressions so much credence, but accept them as they are, then astral projection unfolds naturally. However, if there is any identification in the mind, subtle or imperceptible as it may be, you will stop yourself from advancing.
The solution is to relax and not identify. Meditation, trials, and experience teach us how to remain indifferent before any phenomena and to only remember the intimate divine presence of the Inner Being, no matter in what situation. Relaxation is more than just the physical: it has to do with our thoughts and emotions. If our relaxation is profound, in all the levels of the mind and heart, the body will ease itself naturally, and spiritual perception will emerge, blossoming into your realized potential as part of a patient and gradual process, one that is not rushed.
Joyful in hope, suffering in tribulation, be thou constant in thy prayer.
Benedictis, qui venit in nomine Domini. Osanna in excelsis.
"Blessed is he who comes in the name of the Lord. Hosanna in the highest!"