Neverending story

Okay, I will try to keep this short.  So I have been in this marriage now for four years.  I have worked in mental health  for twenty years and figured out about a year and a half into the marriage that my husband has ADD.  He is on medication, some supplements and have mostly gotten him off aspartame...but he is also type 1 diabetic.  When his blood sugar is low, he is well..lets just say not very nice.  Last night he told me to "kiss my ass", after I suggested that maybe some of his behaviors were because his blood sugar was low. Between the ADD & diabetes, lack of jobs for the majority of the past four years I  really am not sure what to do.  Just when I think things start to look up, they seem to cycle. I support our family financially, emotionally, etc.  Not to mention our three year old and the eight year he has.  We are also Christians, so I really struggle with the thoughts I have about him and our marriage sometimes! But I am really tired and when I try to take care of myself, it seems there is always a greater need.  There is a light of the end of the tunnel if we can just get some things lined up...just seems like that light never comes.......