Right into the neck, I'm guessing into the vocal folds or into one of the muscles nearby. I had terrible bruising afterwards (my fault, I tensed up so hard he couldn't get the needle past my tendons on the first try) but it actually doesn't hurt much getting them, it's just unpleasant.
I had terrible effects on clonazepam and had to stop. Yeson recommended Baclofen 20mg 1 Tablet/ day or Afloqualone 20mg /day as alternatives but I wasn't prepared to risk more side effects. I thought I'd need another Botox shot but instead they recommended frequent neck massaging and lots of water.