no im not married, so i can only tell you how it affects me and those close to me not a partner - which i think would be much harder to bear - living with them 24/7
depression can make you not want to do anything - and lack of sleep can make you angry and short tempered - I used to be afraid to sleep - the nightmares i had were horrible - reliving the event is draining - so I would stay up all night and fall into bed the next day and sleep fitfully for a few hours - i went onto anti-depressants and for a time, sleeping tablets - which my dr was wise to only prescribe a few at a time - i had to try 2 different types of antidepressants before i got the one that worked for me - but they have made a huge difference - once i was sleeping again and seeing a psychologist (3rd one was the one that helped me) things started to drop into place - I kept away from people because i didnt want to be seen as whinging and didnt want to admit i had a problem - if i didnt see anyone i could kid myself i was handling it - yeah right!
I know the times i wanted space my friends misread it for wanting company which only made me cranky because i couldnt join in - i just wanted to be alone - having said that being alone was probably the worst thing at some times for me as i became isolated and depression feeds on isolation.
If you are religious then as suggested see your church person but personally i think it helps to seek help from a psychologist - thats only my opinion - but you must be under tremendous stress and they would help you deal with that and give you strategies to help you with your husband - maybe when its time you could have joint sessions - i hope you find some relief for both of you soon MBC