AAK, Sounds like your H controls you by witholding information. How about a 180 and getting a schedule like AJ suggests? You are getting jerked around and need to set a healthy boundary here. Otherwise you are "Mothering" him and taking care of things while he is off at summer camp. Handle it.
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.