I don't know much about this sleep condition but I thought would comment on the dream a little.

Do you recall anything about what items you purchased or what your feelings were about them? Like Thunder Bow said, you lost something of value. The money and objects probably symbolize something of value in your life that you fear losing or feel that you are losing, but can you say more about what is valuable in your life right now? Maybe this is related to the trouble you are having with the med... for instance it causes confusion between reality and dreams. Certainly someone in a confused state is more likely to misplace or lose things.

The women at the table seem to blame you or accuse you of making trouble. They could represent part of yourself from which self-blame comes. On some level you may feel it's your own fault that some of these things are happening to you in life.

Your are in a foul mood on the bus. Either losing the bag/money, or getting blamed for something, or both, is deeply upsetting.

Mike