Yep, there are some drugs (especially ones that deal with balancing brain chemicals and such) that can be a real pain to the short-term memory ... talk to you doctor, they probably need to adjust the dosage or try less and in combination with another drug ...

The other time I had really bad problems with my memory was about 4-8 months after a surgery I had with full anesthesia ... thought I was going crazy and didn't dare say anything about it for awhile, only to discover later that it is a very common thing after surgery (that and hair loss)