Vent away. I was in the exact same position. Married to someone who did not help at all, I mean nothing. I kicked him out (not b/c of that), and my load became so much lighter. I did not have to deal with him and his mess! I know the resentment you feel at having the be the husband and the wife. The stress is so much.
I can only say for me, it got so much better when he was no longer there. Have you communicated that YOU NEED HIS HELP. Just b/c he is working on himself does not mean he does not have responsibilities to take care of.
One time, I went on laundry strike and only washed my daughters and my own clothes. It took him a bit to realize what was going on (I did not mention it, just did it). Once he did, I have to say, he did help out with some laundry for a while LOL.
Many hugs to you. You are not alone!