First of all thanks for your advice. Here're my detailed symptoms - hopefully you don't get bored first... it's quite a long story
When I fell, I landed on butt and left hand and right hand was carrying bag and purse. After the fall, I was fine and able to drive home but the next day I had terrible pain at my bottom and back. For about two weeks or so I had less pain at the back but I noticed more pain in neck and right shoulder as well as numbness in right arm. I started having hard time walking and keeping my body in straight position because of the pain in neck and right shoulder. I went to see internal med doctor and had accupunture as well but it didn't help so I went to see orthopedist. The orthopedist said I have pinched nerve so he wanted me to have physical therapy for a month. The therapy didn't work well because I wasn't able to tolerate the pain (my therapist was very frustrated ). After having therapy for three weeks, I went back to see orthopedist again because I didn't feel any better and noticed that I had blood circulation problem in my right hand when the pain was really bad. I noticed that my right hand turned red - purpleish but if I raised my hand up, the color looked normal. Anyway, orthopedist sent me for MRI. The MRI doesn't show any abnormality but he suggested me to see neurologist and pain management specialist. So I went to see neurologist and was frist diagnosed with RSD. The neurologist also did EMG test but found nothing. She also prescribed medol pak (steroid - same medication that was prescribed by orthopedist). After seeing neurologist I started getting better. I've had less pain in neck and shoulder and was able to walk like normal people (no more limping) and no more blood circulation problem. However, I still have tightness in neck and tenderness in shoulders.

That's it for my story..... really long one, right? Anyway, my current pain level is 3-4 and it's not really a burning pain - sometimes it's more like aching and dull pain but I sensed burning pain sometimes. I'm not sure whether burning pain is always the case of RSD. I don't see any swelling and don't think I have allodynia. The neurologist said it's too early to tell though...

InHisHands - how long did it take for you to progress to severe pain?

Thanks again for all your advice and supports