You must love your husband very much to have made this move. It sounds like it hasn’t been what you imagined it might be. Please don’t be hard on yourself. It’s a major adjustment to move to an entirely different country and culture.
Yes, you certainly could be suffering from a situational depression. Or – it could be an adjustment disorder. Or – it could also be that you are lonely, homesick and grieving the loss of everything that is familiar to you. Talking to a mental health counselor could help you sort it out.
I’m so very sorry that the language school was so unhelpful. The whole point of language is to speak! As an educator, I can’t imagine scolding people for trying to do the very thing that is being taught. I’m sorry there doesn’t seem to be another opportunity. That being the case, I do suggest you purchase a language program on CDs or online. Having more vocabulary will help you feel less alien.
Although your doctor meant well by telling you to get out more, it is easier said than done. I’m wondering if maybe one way for you to get back into the world is to do some volunteer work with little children. You were a kindergarten teacher so working with children is part of your identity. I wonder if there is a daycare center that could use your help for a few hours a week. Or maybe you could offer to read stories to little ones at the local library or to play with them so their parents can have a few minutes to do their business there. As you know, children aren’t judgmental. Their language is simpler. And you would probably begin to meet some of their mothers. It might be a gentle way for you to venture out. Having a task to do will make it easier to relate to people and will help motivate you to get out regularly.
One more thing: If you haven’t learned how to use Skype, ask someone to show you how. Skype lets us use the computer to see and talk to people who are far away. Skype would let you have more regular contact with family and friends in your own country so you would be less lonely.
I wish you well.