My Special Side effect

I am post-op 9 days and feeling better every day. Praise God, no complications. Howeve,r on my 6 days out my tongue turned black. No, it was not from the chewable vitamin. At 1 am in the morning I thought I was dreaming. It is starting to fade. My surgeon told me that it does happen in rare cases and it will go away in a few days. Anciously awaiting that. Leave it to me to be SPECIAL! I have researed for nearly 2 years prior to my surgery and did not read about this side effect.