I think the self can be disrupted by significant alterations in memory storage among other things. I think memory is one of many key ingredients in having a self. When your memory is adequately disrupted your self is disrupted. Without a self subjective experience is radically different than with a self. It's radically different in that it's often described by the self (who stops being blackout drunk at some point) as being a discontinuity similar to sleep. The interesting thing here is that people who are blackout drunk continue to do things that a clinically-conscious person does (eat, talk, stumble around). Your experience is really interesting too - you seemed to still have an intact self, just not extended memory beyond 30 seconds. I think maybe we are talking about different things or my view is wrong.