When will you be seeing your psychiatrist or MHT again? If venlafaxine worked well for you before, I don't see why it shouldn't again, but understand the horrid anxiety in the meantime. If you have further concerns you should try and get in touch with MHT who can advise you. You shouldn't be abandoned till the med 'starts' working. Hope you manage to sleep anyway. If not, maybe you could take 50mg traz to get you through the night?