Gastric problem do occur in old age. You are taking a lot of medicines also which causes gastritis
. I would advise you to add Tab PAN 40 mg twice daily empty stomach and Syrup Gelusil
1tsf thrice a day. This will help your gastric problem.
As far as subacute subdural hematoma
is concerned, are you having feeling comfortable after the operation or you have any focal neurological deficit? Get a neurophysician opinion regarding this.