Once, when I was experimenting with Hawaiian Baby Woodrose seeds ( it's a psycho-active plant, I used to meditate on) I was having a similar experience. I was staring into a lit candle flame for about 15-30 minutes and after I closed my eyes I saw a glittery medusa floating in front of my soul's eyes. I couldn't figure it out why I have seen it until a very long time. One day, I was really busy and I was concentrating on my work, when an old forgotten friend told me the secret, that the medusa it was brought to this planet, long time ago from another matrix and thus the extraterrestrial look and super abilities a medusa has. The medusa itself is not having a brain, heart- basically is living with light and water, that's all it needs to survive for eons. Fascinating creature, that's for sure!
For me, if I see a medusa now, I feel it is pointing me to be more fluid and watery, not to try to force and control the unknown, and to believe in divine timing.
Hope it helped!
Have a lovely day!