Well for whatever it's worth, you're welcome.

That "feeling adrift" sounds a little bit how depersonalisation and/or derealisation were described to me when I was trying to get diagnoses. I didn't feel like they fit my experience of mental illness at all (everything feels real enough (maybe too much), and I've never felt adrift), and I'm not a doctor so I'd be the last person to try to diagnose either in someone else, but they might be things for you to look into.