Have only just found this thread & read through briefly.
Sorry for everything you're going through OSJ ((hugs))
I think that Dr's see AD's as the answer to everything these days. Although I have been on them myself & they did help too. I was on them for a very long time & could not see me ever coming off them, but eventually weaned myself of them.
I think you will know yourself if you feel you really need to go on them. I think if you are so low & can not see a way forward, then maybe try them out. But if you feel you can get by without them, then dont.
I found at the time of starting mine, they really did make me see things more clearly, & perked me up too, but they also masked my feelings, but that was what I needed.
I havnt known of any bad side affects from Citalopram, although they didnt work for me!
But I think if you can manage without them, then do so. You don't have to take them.
Like others have suggested, I think couselling sounds the best thing, for the both of you that is.
But on the other hand, there is only you who knows if you really want to be with your DH or not. You have to try & look back at where it started to go wrong & why. Can you really get back what you had? Do you want to?
Counselling may let you see things in a different light. It may work, it may not, but at least you have tried to make a go of your marriage, instead of letting it slip through your hands.
Good Luck, hope you both work things out.