hi karvin - my symptoms are very like yours- emg shows problems - can walk for 20 mins one day but suffer the following days- am mainly in the house now. problems for 4 years. feels like problem in thoracic spine too . I am due to have biopsy and another emg and single fiber emg soon. I prey I have mg and really understand your need for a diagnosis. but you do need to keep living too. feel free to chat margaret