I'm starting to feel like there's nothing left to do but give up

Ali • Professional introvert. TV ninja. Evil explorer. Internet specialist. History enthusiast. Queen of everything.
For years now, I've wanted nothing more than to become a mother. 
When I was 17, I had to have an operation to remove ovarian cysts removed (I have PCOS) and this procedure was done so poorly that it resulted in my tubes twisting themselves in knots and beginning to retain toxic fluid in them. 
I didn't find any of this out until three years later when I was sent to the ER for what they thought was my appendix due to the amount of sheer pain I was in. The CT dye contrast scan showed the trapped fluid and I was quickly sent home and told to simply contact my regular OBGYN. 
Once I got this appointment the doctor was completely insensitive to EVERYTHING. (I won't repost the entire argument we had here because he was so out of line and hurtful.) By the end of the appointment he says bluntly "You'll never be able to have children unless you maybe do <a href="https://glowing.com/glow-fertility-program">IVF</a>" though he did manage to get me to a fertility specialist. 
She seemed to think that she could "fix me" and another surgery later, I wake up to find my entire left fallopian type had been removed because it was "too badly damaged". Still, she remained hopeful.
After this, my husband and I went through about 1 1/2 years of fertility drugs and treatments, <a href="https://glowing.com/glow-fertility-program">IUI</a>, and so many other intrusive things. All of this to no avail - not even a single BFP - and six months later she decides to run a dye test through my tubes (to this day the MOST PAINFUL thing I've ever gone through) and the test came back saying my tube was closed again. Here we go for yet another surgery. 
We spent another six months after surgery going through the same fertility treatments as before and still with no luck. Eventually our specialist told us that maybe nothing was happening because I was too fat and that I should have bariatric surgery to try and help. 
And you guessed it - I went through ANOTHER surgery and have lost over 100 lbs. This is good news, but still no sign of a baby. 
We decided that we would try our luck with adoption. We went to every single possible class they had. We researched, we remodeled, and set up the second bedroom to welcome a child into our home...until that fell through as well. 
It's been four and a half years and all I seem capable of getting is depressed when I think about how much we want this and how good of a mom I know I would be. I don't even feel like I  have anyone I can turn to to talk about it because I don't want to burden my friends with the same sad story all the time. 
TL;DR - infertility, adoption fell through, no signs at all of a much wanted bundle of joy.