Hi Kimmer,
Do something for yourself. I found that I had to get out and away from it all at times. I went to the movies , shopping, coffee and walks with friends.
I think the irritability is due to their loss of control over their lives.
I also went to some counselling which I found extremely helpful.
I think involving your adult children is a good suggestion. Perhaps they could sit with your husband while you get some timeout.
And yes, this too will pass and life will get better. Hang in there.
Tammy