I'm not a medical professional, but I am more knowledgeable about menopause and hormones than most. I had no choice, I had to educate myself because every doctor I spoke to was useless. I finally found my way to the rooms of Prof John Studd who was a recognised world expert on menopause and what he termed 'Reproductive Depression.' I learned so much from my appointments with him, too.
The numb, grey feeling you describe is very typical of hormonal depression. It's usually caused by a lowering of oestrogen (your happy, feel good hormone) and an increase in progesterone (the hormone which can help insomnia and calm you, but too much can cause the detached, grey depression).
The fancy name for this is Anhedonia "the inability to experience pleasure or joy." Sound familiar?
Very often, just taking conventional ADs can't help with hormonal depression because there needs to be sufficient oestrogen and serotonin already present for the ADs to interact with. That's why HRT can really help (if not cure) because it's replacing the oestrogen that your body is now lacking. Oestrogen is very closely linked with Serotonin (another happy hormone) production. The trick is getting enough oestrogen into your system so that the side effects effects of progesterone are sufficiently negated.
Prof Studd told me that in severe cases of hormonal depression women often need both HRT and anti depressants.
Just to repeat, I am not in anyway a medical professional, but I hope that some of what I know might be of help.