Can’t breathe + pregnant

Mya

I am currently 22 weeks with twin boys and every single day I get shortness of breath and feel like I’m about to pass out, literally every single day and this can happen for around 10 minutes or more whether I’m laying down or sitting up I cannot get rid of it. I don’t know how many times I’ve brought this up to doctors but it just gets brushed off . Any advice ? I’m not even close to done with this pregnancy and it’s already so bad. I’m worried one day that I might actually pass out and nobody wiIl be here since i stay at home and I’m by myself while everybody else is at work. It’s getting worse everyday and it’s so uncomfortable