I don't blame you -- I could never live in FL (no offense to FL residents -- but my sister lives in coastal GA, practically on the FL line, and I've spent enough time in the state to know its not for me, especially the heat, humidity and BUGS!). I would take Tahoe any day!
It almost seems that if there were a set routine to the moves -- 6 months here, 6 months there -- it would be easier to tolerate. Or if there were an end strategy in sight, and you and your BF decided that this is only going to happen until the end of 2014, or whatever. I can imagine the unpredictability of this leaves you on edge.
I am resisting the idea of even moving out of our house for four months to get some big renovations done, so I can only imagine how hard this is.