Hi Kelly- Don't panic, you are going to be alright. When I stand for any length of time my feet go numb. You did the right thing by getting off them and resting them and the feeling and the coloring will go back to normal. It is the goofiest feeling but it all comes back and just resume what you were doing.
The pain sounds bad, and believe me we can relate. When the fibro first hit I was so sick. I could not do much. If I tried to walk any distance, the pain would go off the charts and I would get sweaty, yet cold to the touch and would have to rest, I felt like fainting also. I do not get that anymore.
Maybe a call to the Dr. to let him know you are not comfortable at all!