The best advice I can give you is not to ask for medical advice on the internet. Ask your health care provider these questions. No one here is qualified or competent to advise you in such matters, which should be of paramount importance to you. Memory loss or difficulty in forming new memories can be significant of many things. Your health care provider should be told of these kind of problems at once if not sooner. If you cannot communicate with your health care provider, get yourself to a different one. Your health is too precious to mess around with.
If you want to swap stories about lithium, use the board to send me a private message. This is not a topic the whole board needs to bear witness to; it's a private matter, IMHO.