Welcome to NeuroTalk:

Thank you for the detailed list and history. You have been on several drugs that damage nerves.

Nitrofurantoin, Cipro, ofloxacin, and Tindazole.

The GI gut flora, must also be damaged and this leads to all sorts of additional problems.

So you should investigate a good probiotic, available where you live. Kefir is a good start. It usually has more beneficial bacteria than traditional yogurt. You may have to find a more expensive probiotic online.

When beneficial GI organisms die from antibiotics, then digestion gets all messed up. Bad bacteria cause gas, bloating and diarrhea. Avoiding sugar and fructose may help with healing if this is your problem.You might have to go gluten free too, to reduce inflammation in the intestines.

We have a neuropathy forum here:
http://neurotalk.psychcentral.com/forum20.html

Continue with the methylcobalamin and make sure it is on an empty stomach for best absorption.

I'd make sure you take a good therapeutic multivitamin too. One with good amounts of Vit A. A damaged GI lining leads to poor absorption of vitamins and other nutrients. Dry skin can be a sign of Vit A deficiency. Do not exceed 8000IU of retinol, however which is the original form for A....betacarotene has less potential for toxicity.

If you are vegetarian you could also be low in zinc and some amino acids like methionine.

Looks like you have been on lots of medications, and these only try to control symptoms and do not allow healing or fix any nutrient needs at all. Your diet and replacing some lost nutrients may be much better for you in the long run.