Hi my name isXXXXX and I'd like to try and help you.
How long has this been going on and are you diabetic or have any kidney disease?
Have you been on antibiotics recently?
Have you had your blood checked in the last year?
Any new medications or increase in meds (such as metformin)?Did your doctor mention any kidney abnormality (creatinine elevated)?
I think that your are having these sensations because your kidneys are worsening. I recommend that you go sooner than July to your doctor and have your blood checked. Being on metformin can worsen the situation so I would give a call tomorrow.
Dr. Zach (online for followup questions)