Doctors brushing symptoms off

I’m 21 weeks , this is my third pregnancy. I’ve had a rough start with severe morning sickness, after that went away, the swelling started, migraines. Over the last couple weeks everything has gotten worse, migraine lasting days ( no medications help) the feeling of the swelling in my hands and feet keep my up, shortness of breath. When I stand up my legs start tingling and I get really dizzy to the point where I feel like I’m going to pass out. I’ve checked my blood pressure and had some readings of 129/96, 137/100, etc. when I’m feeling fine my blood pressure is low 100s over 70s. Went to the hospital yesterday to get checked out and they checked my blood pressure three times, sent me home. One doctor said it was because I’m having a girl. I just feel

Like everyone is brushing my feelings off, I do not feel good. I’m not sure how much longer I can take feeling like this