Hi, I've had experiences along these lines. As you may already know it's never a good idea to add or withdraw two meds at the same time, you can't monitor the effect of each med or give your body the adjustment time required. Three weeks valium use isn't lengthy but you will get more anxious with the 50% drop, if it's too stressful cut the tab by 2.5mg/week. As Airway said, effexor should be reduced slowly if you've been on it for a lengthy time, reduce as per your Dr's instruction, you'll be ok. You need a realistic spell between the removal of each of the three anti-anxiety meds, that stands to reason. My opinion only - if the problems are "med related" it's risky to increase or add any new meds. When did the shaking etc start, was it with the addition of one of the meds?
Nick