I suffer from bouts of depersonalization and derealization, which can be brought on by stress or depression. Mine was first triggered by the use of a green drug that you smoke (not sure on if I'm allowed to say w**d).

It can be very frightening feeling like you're floating around all the time and that nothing is real but rest assured you are safe. Have you tried some grounding exercises? Youtube could be worth a try. However, I would definitely suggest speaking to a doctor if only for peace of mind.

I still have the odd bad day but overall it has got much better as I've come to understand it.

I wish you all the best!

Take care of yourself.