Hi Wileyman and welcome to the community. Meditation can bring up repressed feelings and sensations, sometimes even things we didn't know we were carrying around with us. Bringing up these hidden things can give the impression to a person that they just "came out of nowhere". You may well be sub consciously resisting whatever is coming up to be released. Whenever you feel any discomfort during or after meditation, it simply means you are resisting and it is the resistance itself that is causing the discomfort.
The solution to resisting is to simply and unemotionally observe your thoughts and feelings with unattached curiosity. Simply accept whatever thoughts and feelings you experience, and simply watch them, unemotionally with great curiosity and indifference. When you unemotionally consciously observe something that is not in your best interest, it will simply fritter away.
Each LifeFlow track begins and ends in the same frequency so listening to the last 20 minutes is fine. Just remember, it takes the brain about 8 minutes to entrain so if you listen for 20 minutes your brain will lock into that particular frequency for about 12 minutes. If you listen for 40 minutes your brain will lock into the frequency for 32 minutes. If you're happy with 20 mins for now, that's fine. Maybe just build up the time gradually.
Michael recommends pilot style headphones for best results. You can pick a set up for about $17 -- ear buds will work though. Hope this helps and I wish you an abundance of happiness and joy on your journey of self discovery
