Welcome to HCM
You are diabetes Type II since almost 22 years, your medicines are all right as metformin,Vildagliptin, Pioglitazone
There are some side effects of these drugs like lactic acidosis
for metformin, Pioglitazone causes weight gain and swelling all over body. Hypoglycemia?
With use of drugs for long time there is secondary failure of OHA so you must discuss with treating Physician about starting Insulin at least one time to have better control of sugar level and to save Beta cells in pancreas.
Also a HbA1c for past control of blood sugar level.
Your Symptoms may be due to developing peripheral Neuropathy
, please check it and get nerve conduction study
to confirm it.
A supplementation of B12 helps in this regard you can take it in consultation of your Physician.