Don't Give a Shit ......

After our daughter Mackenzie passed away I sort of fell into a funk of not giving a shit about anything and I think I am still in that funk a year later.  I really don't know how to get out of this funk but something needs to happen like ASAP.  I think my anger for what happened has subdued but I just don't give a shit about even the littlest thing like where to go out to eat if we do go out.  Before Mackenzie passed away the things I didn't give a shit about were few and far between, I usually had a opinion about most things or at least acted like I was interested but not I just don't give a shit about pretty much anything.  I am not sure if this is depression or some other clinical diagnosis but I have come to the conclusion that something needs to change NOW.  I have pretty much stopped giving a shit about myself and I know my wife is suffering because of it and it hurts me to know I am causing her to stress/pain but what can I do?