Hi, Brian,
I know what you mean! When mine first started, it was so bad I couldn't concentrate, or read anything. I'm an avid reader, and was really depressed over not being able to concentrate on anything for any length of time.
How do you block out the noise? Well, I think for me it was a gradual process. First, I had to get myself over the fear associated with tinnitus; just the sound of it made me anxious and upset. I didn't want to take any prescription anti-anxiety drugs, so I found some natural supplements that were calming: Magnesium, holy basil, and pharma GABA. Also, reishi mushrooms. It took some time, but gradually, I was able to calm down, and my concentration improved, too. Now, I'm back to reading books again! It's about retraining your brain to focus on something other than the tinnitus. You can train your brain gradually, by doing simple things. In my case, I started out working crossword puzzles, and reading short articles. I slowly worked up to where I'm at now.
It isn't easy or quick, but it does work. Give it your utmost patience and time, and I believe things will improve for you, too.