I stumbled upon this post after looking up tetanus shot side affects and listing mine, which were severe anxiety, stiff neck, muscle pain, stomach ache, and hand shaking /tremors. I am so relieved to read this. I thought I was losing it when I went through the anxiety and anxiety attack. The hand tremors scared me. Now I understand. Tetnus affects the nerves. Good thing the shoot is good for 10 yrs. I don't think I'll be getting this one again!