Hi Adam.
Welcome to the forum. Have a good look around and read the success stories on here. They might give you some heart.
As Howie says, that HbA1c of 8% is not good. I am sure it is all down to running excessively high Bg levels. That is why you are now getting signs of complications.
There is no 'quick fix'. You MUST get those daily levels lower either through diet or more Insulin. The safest and best option is to change your diet. You may then be able to lower the Insulin doseage with better control.
Are you testing before and after meals at all, do you know what your 2hr post meal levels are ? Can you give us an example of a typical days food intake, including snacks. We might then be able to make suggestions which will get you back on track, get that HbA1c down. All is not lost, you just need some willpower and determination not to let Diabetes take over your life.