You should know within 1-3 days if the block worked. Albeit the soreness, you should feel less pain or no pain of it was successful. As far as working full-time and standing up for eight hours, that's something only you would know if you can pull off. I was being forced out of my job last year by HR and my co-teacher after coming back from six months off work from having knee surgery/rehab/initial blocks. My RSD spread to my leg within a couple days of surgery and I was out for six months and had exhausted all my FMLA. I went back to work for about five days then had to leave again because my father passed away, and when I returned they made my life a living hell in hopes that I would quit. I stayed and tougher it out until December, and as soon as the job offer came in that I had previously applied/interviewed for in November, I gave the principal a five day notice and got out of there. It was definitely a blessing because I was on my feet eight hours a day chasing special education students with a knee brace on and I was still using one crutch at the time for partial weight-bearing, and the principal and co-teacher did not care that I was still under restrictions from ortho and still in rehab.

My new job entailed a desk position where I could elevate my leg to help with swelling, and sit down for the majority of the day, and only includes short walks around the clinic To pick up/drop off paperwork when I'm finished with it. It works perfectly for me because I'm sitting most of the day, and get the opportunity to stand up and walk around to stretch my legs out without overdoing it and causing further irritation to my left leg and knee. There's no way at this point in my recovery that I could stand for eight hours a day as this monster has invaded my leg and is spreading into my hip and my leg swells and becomes discolored and severely inflamed after standing for about 20 minutes. I do believe standing for long periods of time at my old job did contribute to my CRPS becoming worse, so I would not advise it but it is ultimately up to you and what your body can handle. You've gotten some great advice here on how to deal with HR and maybe changing positions at work can help you out. I Wish you the best of luck, and hope things work out for you!