If you already have high blood pressure and diebete, what kind of medicine do you use?

Good day all.

High blood pressure and diebete are two most body condition which i like to avoid at all cost.

How will you treat your high blood pressure? Will there be any ways to avoid it? 

Also I heard if you are a diebete patient, you will start with metformine. But I was wondering if there are any other alternatives , if I want to avoid it?

Also when do you need to start to use insulin? Will it be needed with mild diebete condition too?

Thank you all for your replies in advance