Been there, done that, Rosebud. I have had everything you describe. Horrible, constant pain, numbness, collapsing for no apparent reason, loss of sleep and more. I also have retinopathy. My D was undiagnosed and uncontrolled for a long time, so when I was diagnosed in Oct of 2010 I already had these complications. I was scared to death. I could not imagine living with all this and no one gave me much hope of reversing any of it. Until I came to TuD that is. It took several months to begin to notice some real improvement and almost a year to say that I really felt better. I am now getting some feeling back in my hands and feet and my vision is much improved. I still have a long way to go to say all is back to normal. I also know that may never happen. But the constant pain is gone. It does return for short periods, but that usually precedes a marked improvement.
The key factor in my recovery has been my BG control. I have done everything I can to keep my BG as close to normal as possible. My A1c has been 5.6 or less since Feb of last year (12 mo avg is 5.5). I also take fish oil and r-ala (Alpha Lipoic Acid, the r is important). The ala is also supposed to help with glucose control and may be part of my successful control. Research these things for yourself and make your own choices. As you bring your BG down and as the nerves begin to heal, you will see an increase in the discomfort. This is actually good because it means things are healing.
I have to run, but feel free to ask me anything. It is long and hard work, but it IS doable and well worth the effort.