I totally understand. On 900mg lithium, and under much pressure (I have 5 kids 7-23), I found myself forgetting appt's that I'd thought of only an hour earlier

(I stood my pdoc up twice in 2 weeks.) My family members would tell me things about where we needed to be, what needed done, etc, and I honestly couldn't remember them telling me. My pdoc switched me to lamictal, and it improved a lot.
I still use tools such as my cell phone calendar function, to beep at me for appts, etc. Don't know what I'd do w/o it!
Ask your pdoc about it. Hopefully, he or she will have a solution for it. Good luck!