This is Dr. David
it is more likely your increased anxiety symptoms are causing your restlessness and itching and stomach issues, rather than the medication
you may need additional anti-anxiety medications to help decrease your symptoms.
you may need a stomach acid reducer like maalox or mylanta or zantac or prilosec to help decrease stomach issues.
did your doctor give you additional medications like xanax or ativan or clonazpam to help decrease anxiety symptoms?
effexor can increase anxiety symptoms in a small percent of patients.
you may need to taper off of your effexor and try another medication.
or you may need a higher dose of effexor. what dose are you taking now?
you were taking the effexor for depression? or anxiety symptoms?