Okay, look. You acknowledge you have some mental health issues going on at present. You need to try and separate what is those issues (that you're obviously planning to address with counselling) and what is your marriage. Given that there is no abuse etc. in the marriage, I really think that if you can't see the difference between those two things right now you need to not make any decisions regarding your marriage until you have some clarity.
Now I also think you need to explain to your husband that there are these two competing forces acting on you right now - one being your own mental state, and the other being your assessment of your relationship - and that for the time being you probably can't untangle which feelings relate to which. And that as a result you might say things about your relationship which should - at this point in your life - be taken with a grain of salt. Because you shouldn't (by the sounds of it) be sure, without the help of your therapist, that they are the correct interpretation of your feelings; i.e. that you don't love him, can't love him, don't want to be with him etc.
Let him in, tell him that, and wait for clarity before you take those reins back off him and say, "actually, I've got a handle on this now, turns out I don't love you", or "turns out I had some unresolved issues right there that made me think I couldn't love you".
Whichever it is you will only find out in time. Give yourself the time by telling him what you're going through.
Unless I've completely misread the situation...