Thank you for sharing! What you’ve described makes sense when you view everything as consciousnesses (which some physicists even postulate now). The boundaries created by the ego are essentially illusions, after all.

The scary experience you had also touches on a much misunderstood aspect of the spiritual path (substitute the word spiritual for another word if you find this too loaded). The path is not easy, and sometimes we are not ready for certain practices, or they no longer serve us, or they can bring up trauma—all these things ultimately serve a purpose. I have also experienced scary hallucinations whilst in deep meditation. I think the fact that you opted for a different type of meditation shows that this form was no longer appropriate for you. Though of course I honestly have no idea!