Hi Koukla.
Your signature doesnt list any of the medications you are taking. I know when I was having such awful pain after the pnacreatitis, they gave me sleeping meds to try like Ambien and Lunesta. Talk about an AWFUL taste in the mornings! When I stopped taking those, the taste went away. It could be a new med. Read your pharmacy inserts to see if that is listed as a side effect.
Blessings,