Welcome. We are here for you and as you know, sadly, we can relate.
We understand being exhausted by it all. The lies, the denials, the hope, the disappointments, the wondering, the despair.
It certainly takes it toll on the body and mind. And after 2 years with no change...you sound as if you have almost gotten to the point of indifference.
You and your children deserve to live a life of honesty and truth even if that is without your WH. At least you know what you are dealing with and aren't waiting and hoping for a transformation that isn't likely to occur.
This stops when you say it stops. You have a voice and it matters. YOU matter.
You will tell your daughters that you all need to live differently and that you love them (not sure their age). Tell them age appropriate information (see a counselor).
But ask yourself this...would you want your daughters to believe that putting up with your WH behavior is okay? Would you want your daughters to live through what you are? If not, be the example of strength and courage for them (as hard as it is) and start anew, fresh and with honesty.
Good luck. You CAN and WILL make it. The road is long but you will make it to the other side.