@fiestynan
It could be worth asking your GP to check your Vit B12 levels, along with Folate and Ferratin as Metformin is known to sometimes cause poor absorption of Vit B 12. Be sure to ask for a copy of your results, with the ranges.
If you check the signs and symptoms, you will see that pains, neuropathy, fatigue are just a few of many symptoms possible if Vit B12 or Folate deficient.
More info and advice can be obtained from the PAS/B12 deficiency forum -
https://healthunlocked.com/pasoc