You are not alone, I've experienced tsunami dreams (and other natural disasters). I guess you could interpret it by how you felt at the time of the dream. For me, there was a fear of being swept away - of drowning - so I guess that would mean I was afraid of being overwhelmed by the emotions. That they were so out of control - or outwith my control ;) - that I would actually cease to exist if I let myself experience them.

If that is the case with you as well, I think there is a lesson there, that perhaps we need to learn to face the emotions that we fear because in reality we aren't going to be swept away. In fact, by facing things we can free ourselves a little. Also, knowing that we can choose our emotional state can be very liberating - although easier said than done lol.

That's just my subjective opinion though :) In any event, I find deep breathing exercises, meditation and yoga are my lifeline. Good to talk to you!