@elaine0
Welcome to our group. You are certainly in the right place!
All of us are dealing with Venlafaxine (Effexor) in one way or another.
We are here to help you, support you and advise you (if we can).
I am not in the medical field in any way, just an Effexor user, so anything I say is based on my own experiences, research or things I've read.

First off, 'slowly' means a lot of different things to different people.
In addition, you did not mention what dosage you were on just before starting your reduction.
Lastly, most, not all doctors know how to give good advice when it comes to weaning off this drug.

All that being said, let me tell you that slow can mean days, weeks, months or even years.
I was on 300 mg a day (2-75mg in the morning and evening).
I started with my evening dose in November.
It took me until the end of April (or so) to make a total reduction of just 20%.
I now take just 1-75 mg pill in the evening.
I've been at this level for about a month.
It is my intention to wait until after the summer to begin to reduce my morning dosage to 1-75mg, too.
Waiting serves ME a couple of things.
I don't have to worry about what will happen over the summer while I plan to do trips and second, it is giving my body (and mind) an opportunity to become accustom to the dosage.

What you are explaining in your post is withdrawal.
Yes, withdrawal, just like you hear about with illegal drugs and opioids!
Your brain chemistry changes from the Effexor and reacts when it doesn't get the drug.
Although some of our members were warned about the difficulty of coming off the drug, I do not believe anyone was warned just how hard (and dangerous) it could be!!!
I, myself, am in no rush since I do not have any intention of coming off of it 100%.
It has been the only drug that has helped me!
My first goal was to reduce my evening pill by one.......DONE!
My second goal will be to reduce my morning pill by one.
MAYBE I'll go down to 37.5mg at some point, I'll see.

It is VERY important not to only go slowly, but to READ YOUR BODY.
You body will tell you if you have reduced too much.
It will tell you if you need something else to help you along with the process (even to go back to your last dosage).
DO NOT REDUCE ANYMORE UNTIL YOUR BODY SHOWS SIGNS IT IS READY!
GO VERY, VERY SLOWLY!!!

Good luck!
Ronnie (GRANDMAr)