Your bg is still very high, though the symptoms of shaking and feeling sick could be due to your body telling you that you are going low because you are usually much higher.
Have you had your pulses checked in your feet, can you detect a pulse yourself, prod around there on your instep and see if the pulse there is weak or strong? It really is difficult to say whether its a circulation problem or neuropathy or sciatica, I am not a doctor and even a doctor cant make an online diagnosis, I think you should see your doctor asap and ask for futher investigation. Its also possible that these leg problems are due to mineral/vitamin deficiency, so do get checked out, oh and try to soak your feet (can be up to your calves if you want) in Espsom salts dissolved in warm water, just a couple of spoons of salts will do, this might give you some relief, the salts are very cheap to buy from your chemist.
Do you take any other meds apart from insulin and metformin?
I hope you get better soon
Karen x