Good to hear you are doing better.
Not to belabor the point, but there is data for both vitamin C and asprin if taken for the first 5-7 days after frostbite exposure. A drug called pentoxifylline, which is only available by prescription in the states, might also be worth asking your doctor about IF you keep having problems in that limb every time you are out in the cold. Probably helps most with more severe frostbite, but overall it decreases the area affected. Also might be true for ibuprofen and other stuff you can buy at a drug store, but I don't think the data is as strong for that.
Frostbite is much more common at altitudes over 5000 meters/17,000 feet, so be extra careful on those big climbing trips to asia.
Lastly, if you ever see blisters, especially bloody ones, bypass your doctor and go to the emergency department.
I'm a physician. I've done high altitude research and been an expedition doctor over in Nepal. If you want a recomendation on a local doc that knows more about high altitude/mountaineering problems, pm me.
cheers,
arentz