This "meltdown" is a highly known outcome of the practice (and kinda why people historically do it with guidance in a safe space with a lot of time-honed set of

This "meltdown" is a highly known outcome of the practice (and kinda why people historically do it with guidance in a safe space with a lot of time-honed set of best practices from thousands of years of history). It's kinda like people who are in reasonably healthy mental shape suddenly decide to run an ultramarathon of the mind. I'm not sure if OP may have the correct expectations.