Hi Ada,
The most severe bout of pain I had was last year during December when I was out wearing my flip flops without socks...the ensuing pain that afternoon and evening was was something I didn't want from Santa! The peak of it lasted for a couple of days..I've learned that cold is not my feet and legs' best friend!
When you say that you have been on your legs too much, I think that might be a major caused of the excessive pain...I'll bet the pain level is lower when you take it easy with your legs...
I am learning to pace my self even though I am not a person to measure my movement and activies..but with RSD I know I must...When even a hint of swelling, pain and burn begins I know I've got to rest and elevate (if possible...)
I hope yur legs are better today, so that you can start the week out in comfort..
Hope4thebest xoxox