So... i turned 15 a few months ago and i discovered some youtube channels that spoke about spiritual ilumination and other stuff,i watched a lot finding myself relating to almost everything there and decided i should try because why not. One day i went to my bed and first i took 5 minutes of controled deep breathes and then closed my eyes and cleared my mind,at that moment i seen "something" from my back like my field of view got bigger. I had my eyes closed but i would still see the things behind me and my room,and all that with my ryes closed. I got scared as this was my very first time experiencing something like this so i opened my eyes. I tryed again after half and hour but i was not calm enough so i went to sleep. The very next day in the morning i went to my desk and had deep breathes again. 5 seconds in and 5 out. Then closed my eyes. After like 1 minute i got really calm but then i started seeing a red thing in front of me. Was looking like a tomato but not perfectly rounded and then my eyes started moving involuntary and then turned down. My 2 questions are : is all i went trough these 2 days good or bad? And why do my eyes move involuntary and turn down. Thanks.
Your question is about immersion, so let's address that first:
AN4.41:1.1: “Mendicants, there are these four ways of developing immersion further. What four?
There is a way of developing immersion further that leads to blissful meditation in the present life.
There is a way of developing immersion further that leads to gaining knowledge and vision.
There is a way of developing immersion further that leads to mindfulness and awareness.
There is a way of developing immersion further that leads to the ending of defilements.
Your question can then be understood as asking whether there is bliss, knowledge and vision, mindfulness and awareness and the ending of defilements. If not, then this is not right immersion.
Studying more in the suttas, we read that immersion is preceded by seven other steps. We must therefore ask ourselves if those steps have been followed:
AN6.63:13.1: And what is the cessation of sensual pleasures? When contact ceases, sensual pleasures cease. The practice that leads to the cessation of sensual pleasures is simply this noble eightfold path, that is: right view, right thought, right speech, right action, right livelihood, right effort, right mindfulness, and right immersion.
And yet even the first step is mysterious. What is right view?
SN45.8:3.1: And what is right view?
Knowing about suffering, the origin of suffering, the cessation of suffering, and the practice that leads to the cessation of suffering.
These are the four noble truths. Without knowing the four noble truths, we fall into wrong immersion.
Keep studying the suttas. Keep meditating. Find a good teacher. Be a good person.
A good way to look at you experience is like driving a car or walking. The two serve a purpose - to convey you from one place to another. What you encounter on the way, however, is ultimately arbitrary and unimportant. For instance, I could be driving to Pittsburgh from my home in New York City. I may travel down Interstate 80 and notice the trees along the highway. Maybe on another trip, I'll be especially aware of the gas stations or the number of truck I pass. None of those things are important. What is important is me getting from New York to western Pennsylvania.
From a Buddhist perspective, when we meditate, our goal is to calm and focus the mind to better prepare it for insight into unwholesome preoccupations like ignorance, self, and craving. Anything that is not aligned with undoing these unwholesome roots is just a side road, a tourist trap, etc. that distracts us from our main purpose which is enlightenment.
Don't get me wrong, some of these sights can be pretty interesting. I mean, I almost always stop and gape at the Delaware Water Gap as I'm driving out west. But if we focus on these sights, crave them, and become too interested in them, we'll never get to where we are meaning to go.
Buddhism does not teach practising controlled deep breathing for 5 minutes.
Your question is not related to Buddhism.
When deliberate deep breathing is practised, strange things happen.
For example, i recall seeing a video (here) of a superfit 11 times world surfing champion faint & collapse while doing deep breathing.
Buddhist meditation is about making the mind clear (free from greed & craving) so the mind naturally observes natural calm breathing.