I only wanted to say that the blurry vision and brain fog seem to be common symptoms of Lyme - for me and others here on the forum.
The fever seems a little strange for Lyme since Lyme likes colder than normal body temperatures. I only had a low grade fever when I was herxing (the Lyme bugs were dying faster than my body could keep up with detox). Generally my body temp is 97.1.
I hope you find out soon what is going on. Try and find a Lyme Literate doctor in your area by asking around on this board and lymenet.org - as you may know, Lyme blood tests aren't very accurate, and the diagnosis should be clinical - according to your symptoms.