I was at the dentist a few weeks ago i got injected lower left side & i took a reaction to it started shaking uncontrollably, which i was told it hit a blood vessel & it happens often. I put this down as a one off, then this week i had to get a filling top left, this time i have a nice bruise on the outside of my cheek and i look like a lop-sided hamster! I have never had any problems like this at the dentist before. Could it be linked to thyriod?? currently taking 75mcg thyroxine, 150mg sertraline & have had a TT in 07.