Provisional Teacher Work Stress

So my situation is oddly specific, and it has been weighing on me so hard these past weeks. I have hardly slept and ate, which is highly abnormal for me throughout my stuggles with anxiety and depression. I mention this from the beginning, because I felt like before I started this job, I was on the right track. I was feeling legitimately happy for the first time in years. I had changed to a medication that was working for me, and I was hearing things from friends like, "It was like having the old [me] back!" I had been through a dark period in previous years with my depression that had alienated my friends away. Since then, again, I felt like I was finally on the right track to happiness, which is why I am scared to make changes.

Thus, my situation that has me so stressed out and miserable is that I am a new teacher that is not officially licensed, but I am under a provisional license. I am not in the content area that I bachelored in, and I am stuggling with all of the new teacher issues, such as discipline and planning effective lessons.

Long story short, I feel highly underqualified for my important position, and I feel like I am drowning in expectationa. I hate most of all that the people who love me have to see me go through yet another hard time. Yet I feel stuck. I need advice, and I'm willing to accept any.