I've read your posts with both interest, sympathy and horror I cannot believe how you have both been treated. Sadly though, this has also been my entire experience of the NHS.
I'm 32 and thankfully have two boys aged 11 & 12. But for years I suffered terribly with constipation/IBS, and every doctor I saw just laughed me out of the room. I now it was stage three endo eating away at my bowels. I was eventually diagnosed with endo five years ago, had a lap, and was "alright" for a while. Things started getting shit again about a year ago and my symptoms are very similar to yours: bladder pain, pain on urination, excruciating back pain, excruciating abdominal pain, constipation, unable to pee (I have to think really, really hard to go), bloating, gastro pain - the list goes on.
I had another lap with laser in March, and things were meant to get better, but they didn't. They diagnosed me with Adenomyosis at the same time, and when I came round from anaesthetic the gynae said to me that my uterus was "black and crusty and had to go". Now, against my good judgement, they're going to give me zoladex shots to force a chemical menopause and if it helps my symptoms, I'll get a hysterectomy at the end of it - lucky me.
The reason I posting is because I feel an empathy for both of you, we all have things in common. I'm literally terrified of both the zoladex shots and the hysterectomy. I'm scared of prolapses and the other side effects of hysterectomy. And I understand the bladder pain so much. It's the worst. I normally have to squish a hot water bottle in between my thighs and clamp and just lie there while the meds start working. I drink three litres of water a day! So it feels really unfair.
If you don't mind, I'm going to follow you both. I'm sympathetic and interested in how your journeys will unveil. And if you like, you could check in from time to time on mine. Along with the other brilliant women on here, we can support each other.
Sending love and good luck!