I have been on XL - 150mg for four days and have had a host of weird stuff. Muscle cramps, upset stomache, vision has a strange peirifferial thing going on, little headaches, Really wierd feelings and dreams, I have some mild sexual changes, feeling on edge, mild chest pains, I am not sure it is worth it but I have do something I feel like I am losing my mind. I hope it gets better, I am just about to the point where I am feeling uncomfortable with it. My sleeping has had very little change though and I am glad because I have sleep apnea really bad and will be having surgery for it soon. I have not had any sweating yet though but maybe that is yet to come.