I have recently lost about 20 lbs and I am having trouble going to sleep at night and I am very, very tired during the day. I used to be on Effexor XR 75 and started having trouble with anxiety so she the Dr. changed it to 150 mg. I had no side effects for awhile and now the sleeping issues have started. My Dr. said since I have lost weight maybe I am now over medicated. She wants me to change back to 75mg but I am worried I will start having anxiety problems again. I am not sure what to do, have trouble sleeping or start having panic attacks.