Help i'm crazy!?

I have always been a happy, smart,confident, talkative girl and since returning from overseas have completely changed, always crying, indecisive, forgetful, selfish unable to concentrate, withdrawn, quiet to the point where no one knows how to relate to me, selfish and unable to do things that used to be easy (particularly at work where i make simple mistakes that i would never normally do.) I hate my job, have no direction, hate where i live, have screwed up my friendships. I feel as though i have been living in another world, missing out on real life as i spend all my time thinking or crying. People joke if i smile. I have been diagnosed with depression and been on meds for 4 weeks, counselling for 6 weeks, none of it is working and i cant see anything that will help me. . How can you go from from being capable of loooking after myself over seas to so reliant on my parents, un happy, frustrated and incapable? Has anyone else been similiar and gotten back to how they use to be?