Thank you! i'VE been experiencing this on and off for the past few years. I convinced myself it was from not equalizing properly from scuba but now that you mention DMT, it makes sense! Mine start with a sort of "pop" near my solar plexus and then fills my head. Some episodes I can dismiss but the past few ones lingered on. The ones that linger on makes my blood feel "floaty" like a mild version of my dmt trip.