Nervous?

Am writing this before I go to work, cos by the time I have finished tonight I know I will be too tired to do anything.
I know I can't stand all day, and will be exhausted by the time it is time to come home. My ankle is hurting already, and I'm sat here crying. I hate not being able to do what I should be able to do easily.
I might write some more when I come home. Although I think I will go straight to bed after tea.