That stinks, but sounds like the lobster needs to go. It's an expensive hobby with a lot of variables in it. Setbacks like this are frustrating, but think of the pleasure you get out of it when things are going good.
I had to get out of saltwater for almost ten years due to moving and not having a place for a good sized tank. Right before the move, i lost about $600 in fish to an unknown ailment (back in the days before the net had all these great sites and you had to rely on your LFS
advice). We moved again, got a 75 started back up now and LOVE it. Plan to upgrade to a 200+ in a year or two.