Memory loss issue. A prescription?

Hello Doctor, for the past few years I have been experiencing some memory-related issues. I have difficulty recognizing the faces of new people whom I have met only briefly, even though they recognize me easily. I also sometimes have trouble remembering things, and my brain often feels heavy or like there is pressure in my head. Could you please advise whether these symptoms could have any specific cause and whether homeopathic treatment may help with them? Also, is there any generally safe homeopathic medicine or OTC option that could be taken for memory, concentration, and mental clarity without a prescription? Please let me know if you would recommend any tests, such as an MRI or blood tests, before starting any treatment. Thank you, Doctor.