OMG!!!! What will happen

So I'm 20 weeks today and nothing has really gotten me down not the growing belly not the back aches or the fact that I can't see my lady parts but one thing that has changed is the fact I can't breath oh lord I feel like every step I take I'm losing more and more oxygen... I may be dramatic here but even when I eat it gets even hard I'm at work wanting to just pass out lol I am hoping to stay until 38 weeks but I know it's going to kill me 😳