Hi CC,
Very sorry to hear of continued struggles and particularly the stress of ultimatums from your partner who is clearly going through immense stress as well. Feeds a cycle of emotion in itself!
I have no experience with Effexor but I've been on antidepressants before in my life, for post partum and again after my divorce. I successfully weaned off each time as well without significant problems. I believe that sometimes we need chemical assistance when our tissues no longer produce the chemicals we need to cope. That's how I explain it to myself. It's no different than if I had a damaged thyroid I'd need synthetic thyroid medication... My brain isn't performing as it should so I may benefit from chemical help.
Not sure any of that makes sense, I'm pretty dim today but I'm trying.
The logic and reasoning given to you for trying this, seems a bit weird to me but maybe I just don't understand. In the end all that matters is how you feel, and if you're ready to try some medication to move forward. It doesn't seem like status quo is an attractive option, what with anxiety and relationship stresses making things worse.
Thinking of you and wishing you peace in your heart with whatever path you choose.