Need Medication For Diabetes Mellitus

My father is 86 years old and was treated for HT with Diabettes mellitus. He has also got slip disc and used to wear belt as support for walking. Slip disc was detected more than 15 years back and Neuro Surgeon in Mumbai decided not for surgery. In Nov-13 he fell down from chair while writing. He was unconscious for 1-2 minutes coupled with passage of stool. On undergoing MRI the Impression revealed Age related Atrophy with old Ischemic changes. Study showed CSF and VR spaces prominent. Multiple T2 and flair hyperintensities are seen in bilaterial periventrcular white matter pons and left thalami S/O old ischeamic changes. Venticular system is prominent with perventicular hyperintensities. Ni midline shift seen. Cerebellum appears normal in signal intensity. Fourth ventricle is normal. The effect of the fall was that he stopped walking and there was loss of strength in the legs due to which he was not able to stand up on his own. Now (in April-14) after 3 weeks of physiothereaphy and medicines that include Clacix, Tab Attorva (10) & Tab Strocit 500 - 1 BID coupled with Injection Vitrofol - he has been able to move on the three leg support system. Kindly advise any other treatment for him to improve this situation as he quite often talks all irrelevant things and also gets uncontrolled angry time and again. He is also adminstered Tab Olanzapine 5 mg daily.