blood sugar levels 300 and higher

I was just told that i have diabetes but was given no information about it instead was sent home and told to come back later in the week. The next day my blood sugar was reading 312. the day before it was over 400, why are my eyes affected when the numbers go into the 400 like that? my dr doesn't like to ansere questions or seems irratated when i complain and want to know things. what is the highest the numbers can go before i should get to the clinic? Also what can i do to bring the blood sugar level back down? this one is very important for me to know. Thank you all who answer.

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