Hi I Am 57 Years Old And Having Probelem With

Hi
I am 57 years old and having probelem with eyes I had consulted with my local doctor ,the doctor said this is the symptom of glocoma , initially I was started to use glocoptic eye drop as he prescribe,after 6th month I changed the doctor and that doctor prescribed me lubrex eye drop and asked for eye nerve test and make an operation as soon as possible, I am scared about operations as I am already attacked by sugar and thyroid problem ,BT the doctor said there is no issue with diabetic with eye operation . I am totally scared plz suggest me for the best .