"i started taking venlafaxine a week ago. i already feel more at ease and comfortable in situations that used to make me panic already. my anxiety was making me feel breathless and even ended up at a&amp;e twice, thinking i couldn&#039;t breathe. my doctor was sure it was due to anxiety so put me on this medicine. the first couple of days i was very tired and dizzy but that soon passes. anxiety is an awful thing but hopefully this is working for me. best of luck."