Jnevin, firstly admitting that you have problems or that problems exist is a good start. Counselling approach is also good, I hope that you've got yourself a dedicated and understanding one- you need one right now.
I think a big key to this problem is communication as some of the other boardmembers have suggested. Some of the things you need to find out is: Is she FULLY aware of what's in your mind? How you feel everytime you come back from work?, from counselling sessions, from home to bed lying next to her?
It seems to me that there isn't very much communication here. I am not sure if you are basically stuck or you have the fear of confronting this very apparent problem with your wife.
Either way, do not feel as if there is no solution, nothing can be changed or that you are doomed forever because that is simply false thinking errors. When you are down and things get low in life, your perceptions to things surrounding you changes without you even realizing it(subconsciously). Interpretations to cues, stimuli, events, people and communication messages change more often to negativity (sometimes neutrality) as supposed to positivity.
So, if things seemed down and there is no solution it is merely your negative perception.
What you need to do is to confront this with your wife. If she is who you love, she ought to understand your situation. What kind of a relationship is it if it isn't a fully reciprocated one? Tell her what is going on, don't be afraid or shy of her jugdements. She is your WIFE God Damn it! Tell her exactly how you feel and what is going through your mind.
When I was reading your post, I not only sensed an urgency for help, but I sensed some depression too. Dude, I DON'T want to see you like this. As another fellow human being, I wish that you would get up, pick up the pieces left and work TOGETHER with it. Communication, mutual understanding, mutual support for ongoing relationships and work with it together. If she understands you and TRULY loves you, she'll know when she needs to change, that includes changing her spending lifestlye for whom she loves.
Also I suggest identify exactly (on a piece of paper) where & what the sources of problems are coming from:
eg:
(1) Work - Unfulfilled salary
(2) Wife - Ignorace and Unsupportive
(3) Isolation - Not much energy nor desire to share this with my other friends or get all kinds of help possible.
etc
Work your way towards each at a time. One by one.
You may start with number (2) Communicating with your wife first, it is significant that you have your loved one by your side. Don't feel as if you need to be macho now, you NEED comfort, direction and guidance in which counselling can help to an extent but your wife is certainly an important contributor.
Regarding intimacy & sex life, just because you're not having sex with a fitness-body wife doesn't mean there's something wrong.
In times of stress, of course testosterone declines, sex drives is affected tremendously. For depressed people, sex is never on their mind. So, please don't view this as if you're never going to have anymore hot sex in your life (BECAUSE you WILL! I 100% BELIEVE YOU WILL.)
How old are you bro? Ok, saw your profile, you are 29. Dude, you have so much more going for you in life ahead. Ask yourself what kind of life you would like to possess and live in one within the next couple of years. Set goals, work your way towards it and acheive it.
Jnevin, out of the whole message I found this to be the most powerful statement:
"We've grown apart, and I don't know if I'm even interested in trying to fix it".
Bro, try doing what I've suggested first. If not, then you really need to explore the roots of the problems here psychologically and existentially. It sounds as if the underlying roots is much deeper than I expected.
Anyway, implement what I said and please inform me of anything at all.
"Sorry to show my ass like this"
=>You do not have to apologize yourself for life's misery. It is just the low times in life. Whenever life is low, I ALWAYS believe it is accompanied by a peak afterwards.