I stepped on a rusty nail about a week ago, checked my shot records and saw that I was overdue for my tetanus shot. I went to the doctor and got the shot and some antibiotics within 48 hours, so I should be fine. But I'm experiencing this neck and jaw tightness plus some spasms in my hands and back. 

They're pretty brief though, and a heating pad and massaging it helps. I read that muscle spasms and facial tension can be anxiety-related, so maybe that's it. 

My family and friends keep assuring me that it's in my head and that I'll be fine, but it feels so real that it's hard to tell. I'm scared to go back to the doctor because I've already been twice within a week. 

The worry is getting in the way of my productivity and taking over my whole life. I hate that I'm like this...