Deathsquito have really low hit points and are easy to kill if you simply dodge their attack. If you stand still you will die as you no doubt know.

Failing that, you should have some deer antlers left from the 1st boss, make another pick, in 30 mins you will have enough bronze to craft most of your old gear. Then go back to trying to find a swamp with crypts and forget about your stuff in the plains.