Second pregnancy anxiety

I’ve become increasingly worried about something going wrong this pregnancy. I’ve made it to almost 31 weeks but have been having worsening symptoms that I feel have kind of been dismissed. I’m trying not to get too worked up over it but also don’t want to miss something thinking it was just in my head. I do take Zoloft for depression/anxiety and it helps but idk why I’ve developed a fear of something happening between now and after delivering. I’m scared to lose this baby or myself due to negligence or ignorance. I’ve mentioned my symptoms to my doctor for weeks and they’ve even sent me to l&d before to get monitored. In conclusion they recommended I take magnesium, continue with regular meds and prenatals and get a belly band. I’ve done all that and am still struggling. My main symptoms are headaches that don’t go away and get worse like a migraine with black spots in vision at times, cramping that got worse and sharper on one side, rib and back pains, and ongoing nausea/vomiting. I don’t have high blood pressure or swelling so they don’t think I have preeclampsia but I do have hydronephrosis in both kidneys and protein in urine the past few cultures they’ve taken. I feel like they’re missing something though or just writing me off because I’m pregnant. I’m not expecting them to diagnose an emergency, just to help me get some relief or double check that my baby is healthy and able to be delivered. I suppose I just needed to vent because all I can do is monitor myself and wait to progress..