I have been on WB 300mg for about a month now. I have had headach...

I have been on WB 300mg for about a month now. I have had headaches on and off, lack of energy and an upset stomach to the point of almost vomiting almost every day the past couple weeks. I have not noticed any improvements in my depression. I know it is very common to gain weight on most antidepressants (which would just bring on more depression) but less common with WB which is why Ive decided to try it. Can anyone tell me how long I should stay on WB without improvements before giving up and moving on to something new?