Hi I am sorry about what you are facing. It is good you are getting the emg on Wed. I know the diagnositic testing is draining but hold to hope that it will give you some answers that will be of course easier to treat. May I aks why you had the total knee replacement was it an injury or fall?I aks because if these tests don't come up with anything you may want to look into RSD. I have both RSD and PN. As for sleep I am a huge mess with that I can go on weeks of 2 hours a night. My pain goes sky high at night plus anxiety. Have you tried any meds to aid in this? I just started ativan which may have helped. Trazadone helped me in the past. I would talk to your doctor about that. I hope Wed goes smooth.