Getting a second opinion would be wise. From your comment it seems he maybe suffering from more than just depression.
As far as be "loopy"...certain medications will make him feel a bit foggy/flat at first. If he's still "loopy"/feeling foggy/flat after 3-4 months, his doctor needs to be informed. I totally feel and get your frustration/resentment. My husband is Bipolar and Narcissistic. Like your husband, my husband never helps with housework, the upkeep of our yard, or caring for the pets. He works from 8-3 (desk job), gets home and heads straight to "his" den. When he's having a "good day", I'll see him at dinner. On (his) "bad days", I'll see him every 20 mins. or so, for a few mins., depending on the amount of verbal abuse he wants to throw my way. So yes, it is very frustrating having to help someone who doesn't help you in anyway, and seems to not want to help himself. He's your Husband. For better or for worse. LOL...I heard that! I have a really hard time trying to explain things on-line. Only you know when you've had your ~enough~. And until that time comes you have to do whatever you can to get yourself (and your husband) through this. I refuse to let my husbands illness, anger, verbal abuse, and laziness get the best of me. When he was first diagnosed (we were married for just 10 months), 8 yrs. ago, I told him I'd help him as best as I could, but I wasn't going to give up my life to help him get a grip on his. That job was his, and his alone. I did agree to help him find the right doctor. And I'd help him with his medications. He'd get really "loopy"

on some of his medications when he first started taking them. I knew he couldn't keep track of when and what meds. he needed to take in that state. So, until he got used to being on them and which pill needed to be taken and when, I made a chart and made sure he took his meds.. I did this for about 3 months. Then I gave him HIS chart and HIS medications. Today, I continue to do all the things I enjoy doing. I do what I have to do, if he likes it or not. Believe me....he's tried every trick in the book to keep me from doing the things that make me happy. If he could have his way, I'd be at his side 24/7....jus' in case he needed me for something. You know....to press the buttons on the remote, get him a Coke from the frig., make him a lil snack, and wipe his mouth when he was done. Not this wife. Hell no. Today, he knows better. He can (and does) call me every name in the book. I will NEVER give him ME. So girl....be strong, help your husband till he is able to help himself, never lose YOU, be proud to be the woman you are, remember to pray, and do what makes you SMILE. keep in touch