In all honesty, I've felt like you're describing the whole way through my pregnancy, I'm 33 weeks now.
Like you, I suffered a miscarriage previously, and was absolutely delighted to be expecting. We'd dreamed of this happening for us, but it's been such a depressing and disappointing experience. Don't get me wrong, obviously we're really lucky that baby's been doing well and we're still so excited for him to arrive, but pregnancy has really taken its toll on me. I had terrible morning sickness from week 5-20, I have lower back pain, PGP, my skin's gone to shit, the baby's enormous and so am I, the lipoedema in my legs has doubled, and my mental health has really taken a nosedive...it's just been rough, and not anything like I'd hoped it would be.
I don't have any solutions, because obviously I'm still struggling and I'm weeks away from our due date, but you're definitely not on your own.
The guilt is probably what I've found most difficult. You're not supposed to complain, but tbh I think when pregnancy is as difficult as I've found it, and god knows there are women who have far worse experiences, then I think we're really entitled to say "this is shit and I hate it"...that doesn't mean we don't love our babies, or that we're not grateful that we can have them, or that we're shitty people, it just means we're honest about how horrible and difficult pregnancy can be.
Congratulations on your pregnancy 💐 I'm so sorry you're having such a tough time of it, I really hope it gets better soon!