I have a big problem!!!!! I don’t know what I should do.

I’m in a situation. I miss my mom and my dog soooo badly while I’m at work that I feel pain. Also, during the weekends I get so depressed that the week is coming up and Monday through Friday I’ll have to be at work full time. I feel like I’m wasting my life away behind those four walls at work when I could be spending time with my mom or doing things I enjoy. The co teacher that I work with acts like an ogre and is always criticizing me. I don’t look forward to going there except for seeing my sweet students and getting paid. I don’t know how long I can do this for and I don’t know how to help myself get through this. Any advice would be appreciated! Also if you have a similar experience to mine I’d love to hear it in the comments.