Hi
@Rev-T and welcome to the forum.
Am I right in assuming that you are a Type 2 ?
Many Type 2's are undiagnosed for several years (even a decade or more). Do you know what your HbA1C was at (eventual) diagnosis? The lower limit for actual T2 Diabetes is 48 going up to over 100, though pre-diabetes or 'at risk of diabetes is shown by HbA1C in the range 42 to 47.
For a Type 2, high blood glucose is caused by the combination or 'insulin resistance' and eating too much carbohydrate. All carbohydrate turns into glucose (sugar( when digested and when you have insulin resistance then however much insulin your body produces, it doesn't do a good job of removing glucose from your blood and 'safely' storing it in your muscles and fat cells, so the glucose levels in your bloodstream get too high.
I have no idea what is going on with your veins, but your doctor obviously feels that your pains in your legs muscles and soles of feet may be due to diabetic neuropathy hence the Pregabalin. Pregabalin. Though form your description it may be cause by something else.
Pregabalin doesn't (usually) work straight away (unlike a conventional painkiller), usually you start off on a low dose which increases after a week or so. I'm unfortunate in that opioids (such as morphine and tramadol) have no pain relieving effect on me, so I was prescribed Pregabalin for my 2 bouts of sciatica (which is a pain in the sciatic nerves). The first one was the worst and it was only in the 2nd week (on an increased dose) that I felt the benefit. The 2nd time I started on pregabalin quicker and it had an effect quicker. But pregabalin doesn't always give pain relief for nerve pains in everyone, indeed it's primary use is for epilepsy.
Most T2 diabetes medications don't work as well as just eating less sugars (including fruit) and less starches (including all grains and potato ) will do. However it seems as though your 'anti-sugar' medication may be
gliclazide or something similar which can cause dangerous low blood sugar (hypos) if no or very few carbohydrates are eaten - so if you want to reduce your blood glucose levels, do it by slowly reducing the carbs you eat, monitoring your finger -prick blood glucose levels and if required slowly reducing your 'anti-sugar' medication.
Metformin tends to work by reducing the amount of glucose that your liver produces, but since this is usually much smaller that the amount from digestion of the food you eat, it has only a small effect. It's the glucose from the liver which is causes us to still have some level of blood glucose even after fasting for a few days ( an anti-starvation mechanism so that as cave dwellers we almost always had enough energy to go hunt/gather our food).
Metformin is probably causing your sickness if your BG levels are only in the 9 to 13 range. If they were higher, then it would be more likely for the high sugar levels to make you feel tired and sick, though if your body got used to much higher BG levels before your medication started, then it could be that it needs a period of adjustment to the newer lower BG levels.
This is just a brief intro to T2, so please ask more questions if you have them.
