Giddiness, Right side lose co-ordination

I am asking this query for my uncle / 58 yrs. While going for morning walk he experienced giddiness, right vision got blurred, could not stand and nearly fell down but managed. From then on he has giddiness, intermittent headache, his right side steps are going out of co-ordination, finger tips get chill in both hands. We consulted a neurologist nearby. He suspected TIA and asked to take MRI with contrast, MRA and spine screening. MRA results are normal. But MRI shows a 19x12 mm homogenously enhancing lesion with lobulated margins and T2, T1 isotense signal seen in the left cerebello-pontine angle abutting to left petrous apex and extending in to left Meckel's cave -?Trigeminal shwannoma ? Meningioma. The doctor said lesion is not the problem and surgery not required. He said the problems are due to lack of blood flow to brain and suspected TIA or seizure and prescribed tablets for 1 month. Taken tablets for 1 week. Same all symptoms still persists. No improvement till now. Pls advice.