Although diabetic neuropathy
and under active thyroid both can cause your problems but since you are already being treated by doctors,I would like to get you tested for serum calcium,potassium,VIT B 12 and VIT D.Deficiency of any of these can cause tingling
and pain in your body.
Your nausea could be because of gastritis
caused by regular intake of pain killers.
You may take some proton pump
inhibitor like PANTOPROZOLE 40 mg ,once a day on empty stomach in morning.
Keep continuing your other medications.