Things often get worse over the course of the day. It's just from having to use the limb and all. Frustrating as that is, it's very "normal". Including the numbness and cramping as well.
It often takes some trial and error to find the meds which will help with the pain, muscle spams and burning. I'm not sure upping your current med will help much. Would he consider giving you something else for the pain? I'm lucky to manage with vicodin 10mg 4 x's a day and baclofen for the spasms and jerking 10mg, 3 x's a day. I was on Lyrica but it made the numbness in my legs worse so I quit taking it after a year.
I was a work comp case so I know things will get rough for you. I know others have mentioned a getting a lawyer. I second that one!! It seems like once you're dx with rsd, wc gets nasty and the denying and delaying begin. Lawyers offer a free consultation. Take advantage of that to find a good one. I was lucky to find a great lawyer. He was the first one I talked to. I was even luckier because he knew what rsd was, what it would do or could do and had represented and was representing many other rsd'ers at the time. They get paid when you settle your case.
Hang in there! Research and be your own advocate and keep that fighting spirit!!
Karen