Torsemide will also deplete magnesium.

Here is the list of nutrients that Torsemide affects negatively:

calcium
magnesium
potassium
sodium
Vitamin B1 (thiamine)
B6
Vit C
Zinc

If you are using an ACE inhibitor, you would have additive losses of zinc.

Anything that impairs the circulation in the extremities may create muscle symptoms. You can test this by using moist heat on the leg affected. If your electrolytes are normal, and your calicum/magnesium ratio is good, you might see some improvement with moist heat carefully used.
Soaking in epsom salts might help that feeling too.

You have some very serious medical problems which means you should clear any supplements with your doctor(s) before using.

I would also get a Vit D test done ASAP.
The new medical video that just came out explains why:
http://neurotalk.psychcentral.com/thread92116.html

Edit to add, it might be a good idea to get the DNA methylation testing to see if you have elevated homocysteine issues affecting the blood vessels. This is called MTHFR polymorphism test. Patients who do not methylate properly develop cardiovascular disorders commonly.