... days now I have had an upset stomach. No nausea but having to go almost constantly. Does this ever stop? Is it normal?? Also I am taking it at night but thru the day I am so drowsy I am falling asleep at my desk! Help!! Advice??

Now I am wanting to start my weight loss pills again, phendimetrizine. Can anyone tell me if these 2 drugs can be taken together without any negative effects? Any info would be great! Thanks!!