I really think you are being so smart about this all. One of the best pieces of advice I've received is if you have a temptation -- something you are trying to avoid bc it makes your symptoms worse -- instead of picturing yourself enjoying whatever food or drink it is -- instead think about the symptoms you will likely experience if you go ahead with it, and think about whether it will be worth it. If you decide it's worth it, then go for it without guilt. (For example, a piece of cake on your birthday may be worth it.) But usually it won't be worth it, and it may stop you from injesting something you will really regret later. I find this mind trick helps, and it sounds as if you are doing something similar.
I have similar issues -- Dr. calls them parasthesias or neuropathy. I am lucky that mine doesn't really hurt like it does for other people -- I do have pain, but not from this. Mine don't go on and off though. They are there all the time. Just feels like my lower legs and arms are asleep all the time and my feet especially are a bit numb. I feel clumsy bc I have reduced feeling in my hands and feet. If I don't take my gabapentin, the feeling "crawls" up to the top of my legs.
Along with it, I also get what I call "zaps" where I get a sometimes painful but always annoying feeling like an electric shock goes through part or all of my body. It may last a few seconds and goes away.
All of this has, so far, been attributed to FM by my doctors. I am seeing my neurologist a lot lately about it. See my earlier post on "Small Fiber "Polyneuropathy" if you want to read about the whole saga.
I have "given up" sugar but not white flour. I applaud you for doing both, Debbie!
I placed "given up" in quotes because I've given it up except when I cheat, which is often. To be fair, I find even reducing sugar intake helps. For example, I eat my same old peanut butter (Jif) which certainly contains sugar, but I wouldn't eat donuts or a chocolate torte or a can of Coke because it's too much sugar. (Except if cheating!) I still eat all the fruit I want, etc. I just try to minimize processed sugar.
For me, I tie the feeling better to the chronic infections part of what MiMi calls "the dragon" (aka Fibro). I have chronic yeast/athletes' foot infections. (I know several of us have posted about this in the past.) Sugar is food for yeast and encourages its growth. Giving up sugar not only got rid of these infections, but (I think) because now my immune system is not trying to fight it off constantly, I feel better! I am serious, people, I had toenail fungus that would scare off a serial killer, and without sugar, it's simply gone! Ew! TMI!
The more I read and experience, I just feel that processed sugar is really toxic to our bodies. Probably true of white flour, too, but I haven't gotten there yet.