To answer your first question, yes, meditation without ethical discipline leads one into the development of the ego and black magic, because fornication and drugs strengthen the vibratory capacities of the Kundabuffer organ. This is why ethics is the foundation of all spiritual discipline, no matter the name of the religion.
Within Islam, a Sufi master was told by a disciple, "So-and-so can fly!" This Sufi master answered, "Yes, but so do the birds of the sky!" He also elaborated, "Even if a person has the ability to float and levitate in the air, but who does not follow the prescriptions of the Qur'an, shun him!"
What you're experiencing through mindfulness are deeper states of the subconsciousness, unconsciousness, and infraconsciousness. It is good that you are becoming more aware of yourself; the challenging part, now, is to confront these psychological elements and to not run away from them, for many students reach this stage and state, "Gnosis is harming me! I am seeing all these demons!" Meanwhile, such persons are only becoming cognizant of who they really are. This is normal.
Remembrance of God always brings about strength, security, and peace. Our prayer is strengthened and deepened through transmuted sexual energy, so pranayama or alchemy is essential. We need sexual power to illuminate and strengthen our hearts, therefore, to help you, pray to your Divine Mother and transmute every time you meditate; then listen to the Voice of the Silence, which is internal illumination. The deeper you practice these factors, comprehending and annihilating fear, the stronger your relationship to God becomes, and thus do you develop genuine confidence.
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!"