Why PP prescrive 50ml of Lisipril?

After 2 years my primary physician high dosage of lisipri I think is helping me. But now I have a severe side effect is call tinnitus, is horrible high ringing in both ears. Any feed back for this tinnitus is geatly appreciated. I am sorry for the poor grammer, but I was not able to sleep last night. Thanks, for reading this short comments, any feed back will be greatly appreciated.