Gosh. I don’t really have special advice for you not knowing anyone, who has been through this.
I tried venlafaxine many years ago but didn’t find it terribly effective. Perhaps my dose wasn’t high enough but it interfered with my sleep cycle. I was changed onto another antidepressant, which worked. With your gf, I would think the doctor should perhaps be exploring taking something alongside this seeing as your gf is on trial no 5. But that’s just my lay opinion.
Idk how old she is or if she’s getting family support for day to day things. Have you spoken to her / her family about her prescription meds? Seeing as there is no permanent doctor there, has she / you / they contacted her normal Gp surgery for advice on how to get more support? If the M&B unit are not providing her with what she needs, maybe your Gp can be assist or apply some kind of pressure. It is pointless to admit her then discharge her before she is well.
You also asked about private support. It seems to be very difficult these days to be seen by a clinical psychologist or psychiatrist these days. When I had an episode of major depression almost 30 years ago, I was put on a waiting list and saw a clinical psychologist weekly at the hospital for over a year. A few weeks of CBT that seems to be offered these days really doesn’t cut it.
Many years later, I paid for my own therapy with someone, who was amazing. I’ve finished now. But therapy sessions are about £50 an hour and I saw someone ever 2-3 weeks for 2 hours at a time as I found long sessions more effective for me.
It sounds as though she’s taken a big step back from the relationship to protect herself and ensure she can care for the baby to the best of her ability with her current resources. I think right now you need to protect your own mental health, ensure the baby is ok and face that your relationship may not last. Perhaps it will with time and if she can find more balance things with change between you. However, you cannot depend on this happening.
To access the support, I’ve found you often need to know how to do it. This is basically making your voice heard, asking for referrals and if refused, asking for second opinions. You can also say you’re not happy with certain treatment and if nothing is done, there are ways to complain, which you can google.
Can the Gp get her referred to a proper, open ended specialist therapy from a clinical psychologist or psychiatrist? And if not, can they get her on a pathway so that she can eventually be referred?