Hi clarkstar,
Did you discuss these findings with your Neurologist or the Doctor doing the infusions? Perhaps they are linked in some way. Did your short-term memory be noticed by you real quickly, or was it happening over time?

I would discuss this with both of these doctors to see what they think is the cause. Find out if it is Ty related of not. Good luck to you. I hope it is only a temporary setback from some meds.