Lamictal and great memory

I have been on Lamictal for about five months for bipolar II. I has been increased slowly over these months and I am now up to 300 mg a day. I have a tendency to sometimes forget things but remembering numbers has never been a problem for me. In fact I can look at someone's tag number driving down the road and remember it for days. Phone numbers of people I have known for 20 years would stick and I wouldn't even have to call them on a regular basis to know the number. However, recently while trying to use my bank debit card at the store I was asked to enter my PIN number and totally could not remember. I tried it several times but it never came to me. I felt like a fool!. At this time, that was three days ago and I still cannot remember it!

This is very, very distressing to me. I feel like something has been wiped clean and that I will never get it back.

My Lamictal dose has been increased in the last couple of weeks and I thought maybe Lamictal or one of my other meds could be making this happen so I started researching and found this site where other people were complaining of memory loss while on Lamictal.

Headaches are another common side effect for me while on this med. It has really helped me emotionally and I need to know if the memory loss is just going to be a temporary thing and it will get back to normal or if I will be forgetting more and more over time. PLEASE HELP!!!