First Day of Teaching

I am exhausted. How do people do this for more than a year, more than a day?
My legs are killing me. I stood ALL day. I have to. Where I am supposed to sit? The only desk I have is on the side and they didn't get me a stool like I asked. My voice hurts. Way too much talking. I have homeroom for 20 mins, English 1 for 45, then a planning period, then 3 more classes before lunch, which is way too short, then 2 more classes, and a planning period at the end of the day. Ugh. Two of my classes are English 2, the repeaters who have passed English 1, though I have a few students who are in both my English 1 & English 2 classes. Drag. So much for doubling up on assignments sometimes. I don't know how I will survive this. I am so tired I can't even think or be at all motivated to do anything, but then I'm so anxious I'm not sleeping well. It's hard. By far the hardest thing I've done. Being up there in front of them. Trying not to forget anything. Forgetting everything. I need help. Who does anyone do this and feel like they have any interest left?