What should I do if my attorney refuses to file a motion to dismiss stating I had no memory of the events?

Hire another attorney.

First of all, if he filed a motion he should have said that he had spoken to you and you told him certain facts or included an affidavit by you for it to be properly made upon "information and belief". Second, it is not a motion that will be successful, and if you did not tell him that you had no memory of the events he cannot properly make the motion. Third, a lawyer should always return your calls and emails the same day or there is a lack of communication and he is not paying attention to his clients, and that is not a god sign. I have never heard of such a motion and it is not going to result in any favorable decision.

Well I have not seen the police reports and do not know how much time elapsed before the matter was charged. Without that I have no idea how well your attorney is doing.

While I believe that the attorney should keep you up to date regarding your matter, I would also defer to his or her judgement as to how to proceed. If you are unhappy with the representation, you should first consult with the attorney. Find out why the attorney filed the motion - and try to understand the overall strategy. If you are unhappy with the result of that communication, get a second opinion, but do not terminate representation without another attorney ready to step in. You would not want to miss and filing deadline or fail to respond appropriately.