Lisa, just a thought - my Neuro. told me that at higher doses, the Venlafaxine acts more on Norepinephrine and can therefore be stimulating. Lower doses, it hits the seratonin receptors only. I'm wondering now that you are in menopause if this is in fact too much of a stimulating dose, and might be adding to or indeed causing your anxiety and agitation? Higher doses are more likely to cause sweating as a side effect too, whereas anything up to 75mg can actually help with hot flushes (it's a funny drug)!
These are just thoughts based on what I was reliably told, but it might be worth checking with your prescriber to see if your dose is still suitable for you at this time. xxxx