Yes, it is possible for your body to get so used to a med that it no longer works for you. I am on a few forums and that is a common comment from members. Strange that your anxiety has increased as Cymbalta is FDA approved for generalized anxiety disorder. A med I take for anxiety is propranolol. It is a beta blocker used for high blood pressure, anxiety and akathisia.
Re: above , I meant Cymbalta , not Effexor. : )
Hi clydo , yes , sweating profusely is a recognized adverse effect of Effexor. For more information check out the product information on the leaflet in the pack , or their website - there's a whole host of possible side effects.