It sounds like your journey to come off Venlafaxine has mirrored mine, admittedly I didn't start at the same high dose as yourself but I too stopped at 37.5mg and then nothing. I am on day 7 today without the drug and I feel like I have come out the other side... the flu symptoms have disappeared, I am sleeping better (already!), the sweating is easing, as are the nightmares. The most uncomfortable effects for me have been dizziness, brain zaps, nausea and diarrhoea... today I have no nausea or diarrhoea, the brain zaps are there but they are becoming less noticeable; I do still feel the same amount of dizziness but I can cope with that, I am working from home, don't need to drive and so I am happy to sit this one out until it ebbs.

@jakedduck1 - may I offer my reasons for not tapering past 37.5mg. Like @kirsty29 I am taking the tablet form of Venlafaxine (sorry if I have interpreted this incorrectly), this is the lowest possible therapeutic form of the drug unless you wanted to split the drug; there isn't the opportunity to count beads unless one switches to the capsule form. This was offered to me as an alternative but my reasons for the choices I made were as follows...
I wanted to drop the drug entirely over the shortest time possible, my GP said I could do this at 37.5mg without relapse of depressive symptoms... bear in mind I had been at this dose for at least 6 months, my GP left it up to me for when I was ready. He did offer to switch me to the capsule form so I could count beads but, my main question to him was, is this likely to prolong the withdrawal symptoms I am likely to feel?... he said yes... that was enough for me not to do it. I knew there were going to be unbearable withdrawal symptoms, I was prepared for lying in bed for days if necessary, I just wanted it to last for the least amount of time possible.

Here I am on day 7 and I feel like the worst is over; I can live with the symptoms I have for weeks / months if necessary. I feel so proud of myself, I feel like I have done it already and the clarity of mind I am experiencing right now is something I haven't felt since taking the drug. I naively thought at the start of this journey that, based on the half life of the drug, I should be home free after 3 days - tops - how wrong was I? Nevertheless, on day 7 I feel like there is light at the end of the tunnel, I am closer to normal now than I have felt in a long time, I feel hopeful... the end is near xxx