Is to possible to have peripheral neuropathy without any comorbidities ? no diabetes, no thyroid issues, no vitamins deficiency nor any heavy metal poisoning. what can be the other reasons to have neuropathy if these does not fulfill the criteria?

Sure. Many, many. Syphilis, HIV, degenerative neuropathy, multiple sclerosis, polymyositis, etc. etc. if real and persistent you need an evaluation by a Neurologist.

If you drink alcohol, that may explain it. If you do drink, stop entirely and do not drink again. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs.