What Causes Giddiness, Intermittent Headaches And Cold Fingers?

Question: 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 gets 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-pointine angle abutting to left petrous apex and extending in to left Meckel's cave -?Trigeminal schwannoma/ ? Meningioma. The doctor said that the lesion is nothing to worry about as these symptoms are not due to the lesion and said just to leave it and surgery is also not necessary at present. He said the problems are due lack of blood flow to brain and said it could be due to TIA or seizure and prescribed these medicines for a month; Ecosprin, Cognione, Stropill and Divalgress. My uncle has taken these medicines for a week now. But no improvement. He still has all those symptoms. His BP is at 130/90. He is diabetic fasting at 260 and PP at 320. HBa1c at 12.7.
Pls advice for a second opinion.

Thank you Doctor for the reply. I have a couple of clarification which I believe you could help me to understand.

I understand that TIA is the cause for his present problems but not the tumor. Pls correct me if I misunderstood you.

Also, he is under medication for 8 or 9 days now. But he still has the same problems. By continuing these medicines, tentatively when he could start to feel the improvements. Would a surgery be needed in his case for the tumor.