Wow...that would be so hard - I can see why you'd be feeling down. It's so hard to make changes sometimes even when you understand the reason for doing so.
It may take some time, but maybe you can find a few things in Pittsburgh that you like...a good LYS, for example, or a good library if you like to read. Try to find a few small comforts and things will look up. I'm not super familiar with PA, but I know there are quite a few places with open space so maybe if you can find some of those (e.g. pick your own fruit or something similar), you can get back some of the open space feel while retaining all the good services for your child.
It's funny...everyone talks about how noble it is to sacrifice what you want and like for the good of something else...but I am here to tell you that it really sucks too! Pardon the language, but there it is. It is SO hard to do the right or good thing when it pulls on your heart to do so...but there ARE inherent little blessings that you will notice - whether it is an improvement in your child or a new friend you'll meet or just something even simpler - hang in there.
I know it's hard when you feel pulled from what you know and love - I'm out here living on the East Coast when my heart is in the Midwest as well so I can certainly relate. Feel free to PM me if you need to talk or vent. I'll pray for you and your family.