I believe that there is a frequency at which a brain functions, they can vary depending on circadian rhythm or other factors. You can check the various effects on the brain caused by varying frequencies. Check this link -> Binaural beats. When we expose our brain to isochronic/binaural beats, it has a resonating effect on the brain, i.e. the brain starts to alter its frequency in order to synchronise with the tone. Once the specific frequency is achieved, you will have the desired effect (depending on the specific frequency you are trying to induce).
Isochronic tones have only been proven to have an effect while you are listening to them, that’s why you won’t find me claiming anywhere that there are potentially positive long-term effects. Once the tones stop, your brainwaves are no longer being stimulated by the sound and so they stop being in sync with the tone frequency. For you to think you are still feeling the effects after all this time and from such a short time listening to them, I think it may be linked to anxiety. I know that some people who are new to this type of thing can build up a strong feeling of anxiety, after worrying about the potential effects brought on by fear of the unknown. I suspect the problem may be psychological with you worrying about the potential effects and keep repeating the experience from memory in your head. When you keep going over the same thing in your head like that and worrying about it, it’s easy to then spot other potential side-effects like how your nostrils and body temp is feeling, then making links back to that experience and labelling that as the reason. I think the best way to overcome this is to realise that the side-effects you are mentioning are completely unrelated, so there is nothing to worry about. These tracks are literally listened to for millions of hours a month on YouTube across loads of channels. If the effects lasted for a long time people would just listen for 5 minutes and come back in a couple of weeks. But people keep coming back to listen because that’s the only way to feel the benefit and effects…while you are listening to them. If you are unable to stop thinking and worrying about this on our own, I recommend that you speak to your doctor about it or a specialist in dealing with anxiety issues. I hope that helps.
***NOTE: (Last one) Please do research on which brainwaves do what before just trying out the first track you find! Also read descriptions of what frequencies are being used in the track, so you know what you are training your brain to! (Example: You struggle with OCD and have some anxiety. You see a track titled “Clear, Focused Thinking” and you try it out w/o reading the description. You either do not experience anything or you end up with worse anxiety/headache than before. If you knew before starting, that your problems were caused by too much Beta wave activity in your brain and the track was all low Beta ramping up to high Beta – you would not listen to it!)
As soon as this session begins, the 10Hz frequency kicks in, helping to release your worries, brighten your mood, and encourage release of the happy hormone, serotonin. This is followed by progressive patterns of euphoria-inducing beta frequencies, each building on the last, helping you to get you energized and feeling great. The uplifting background also gives this session an added kick. An excellent way to start the day - but don’t use it too late, as it may disrupt your sleep patterns.