I read your posts and they make me feel ever so sad inside because I used to feel just like you, and I thought that it was just how marriage was meant to be too. That this was what 'compromise' was. But from the way you talk about yourself, I don't think you sound like you need to compromise more, I think possibly you need to compromise LESS.
It sounds like you may have compromised so much that you have lost sight of who you really are, so you feel lost, frustrated and lonely, like you are being judged all the time because you feel you have changed so much you need some external approval to remind you that it is all going to be ok...
I may be wrong. But in my case, when I felt like that, I was being judged by my husband. He put me down all the time, raised the bar everytime I met his expectations so that I always felt I fell short - that I needed to try harder, do more, stop complaining, be more grateful. You may feel isolated and judged and angry and frightened because that's how your husband is making you feel :(
I know that this will sound blunt and you may feel that it's unhelpful but I really do want to help you - I don't think it's possible to feel the way you do unless you are a) clinically depressed or b) being treated in such a way as to make you feel worthless.
If you really don't think your marriage is to blame then I urge you to talk to your doctor as others have. But from what you've posted, I think perhaps deep down you do think your marriage (ie, how you are treated and feel within your marriage) is the problem. In which case, please know you are not the only person who has felt like this. And being punched in the face isn't the only way you can be beaten down by a man, being picked at with words can be just as brutal, I know.