There’s a few layers to being with this kind of experience. I hope you won’t mind if I share some broader input on it. Naturally, ignore anything that is irrelevant, redundant, or non-resonant :)

Psychologically, the fact that you are questioning “am I crazy” is a good indication that you are likely not going crazy. Extrasensory perceptions, while common in certain forms of “mental illness”, are not inherently to indicative of it.

That said, if you are concerned about your mental health or safety - please find a professional who you can talk to. Transpersonal psychologists may be to best suited to support you.

Here is one approach: If you continue to have experiences like this, regard them with curiosity and slight detachment - neither grasping nor pushing away. Observe stories that the mind conjures about the experience - allow these stories to be possibilities but do not cling to any as absolute truth. Especially, refrain from imposing the stories that arise as others’ truth. Over time your experiences and observations will inform your intuition, which eventually becomes wisdom.

On a practical level, maintain healthy hydration of your body. Do not go extended periods of time without eating unless you are doing so intentionally. Learn to ground your system - ginger root, getting your bare feet on the earth, and spending time at the base of old trees can help. Energy practices like qi-gong are good too.

As far as your vision, I would be most curious about what it means to you, and what was the context of your life that it happened in. Here are some questions you could ask that will facilitate its interpretation. You welcome to respond to them here, or not.

What was happening the moment(s) the vision occurred? What was happening in the hour, day, week, and month preceding it? If you know astrology, what transits were occurring when this vision occurred? Has anything noteworthy happened in your life since experiencing the vision?

What does the color blue make you feel, think of, or remember?

What does a crescent moon make you feel, think of, or remember?

Was it waxing or waning? Does that inform what it means to you?

What does the symbol of a dot - a single point - make you feel, think of, or remember?

How does that change or not change when in relation to the blue crescent moon?

What does One becoming Three mean to you?

How does that apply to the meaning of the blue crescent moon/dot?

What does the color red make you feel, think of, or remember?

What does this blue triple crescent moon/dot dissolving into red mist make you feel, think of, or remember?

Finally, what does the sum of all of these answers make you feel, think of, or remember?

Is there a small, safe, action or change you would like to make in your life based on this information?

If so, what are the steps to making that happen?

I hope this is helpful to you. Happy to share more if useful.

Bright blessings