Hello Welcome to Ask a Doctor service I have reviewed your query, and here is my advice. You have given the history of cardiac and cerebral disease, (Valvular heart disease, cerebral stroke ) if having these kind of diseases then some neurological symptoms are likely, like forgetfulness, speech difficulty, and other, with the proper therapy like physiotherapy, rehabilitation, symptoms can be minimize, medication have very little role unless it is the diabetes or hypertension are there. Hope I answered your query, let me know for further assistance.