Clot in brain. Not take) and medicines.

On 26th of aug,2019 night my father age 65 ,got partially unconsious.he had sweating and feel numbness in body.after 4-5 minutes he felt relaxed.Next day this happened again 2 times and it was more critical. We went to the hospital and doctor admitted him to the ICU and did CT Scan,ECG,X-ray of back side (chest) and other tests and find few lacunar infarcts in bilateral ganglio-capsular regions and diffuse cerebral antrophy(age related).After 2-3 hours of treatment in ICU he felt good.Doctor(Neurologist) said that he is completely fine but would admitted in ICU for 2 days.He dischared after 2 days and Doctor gives "nervimed" and "aspirin-75" medicines for 10 days.His ECG report is normal,X-ray report is normal.No blood sugar and BP is normal.No HIV and hemoglobin is 17.4. Please advice me the risk factor and the chances of problem again in future.What should be the diet(what take and what not take) and medicines.