Severe shortness of breath, Very lethargic

I am so short of breath that simple tasks like folding laundry or loading the dishwasher cause me to lose my breath. I also feel so lethargic - all day long - that no activity appeals to me. This has been going on for 5 days. I am in decent shape, eating well and taking vitamins with iron. I’ve called the doctor and they’ve scheduled blood tests and a cardiac/respiratory test. My father died 5 weeks ago, so some of this may be due to feeling sad or stressed...but the symptoms seem really extreme. This is my third baby, and I haven’t dealt with this before. Any ideas or suggestions? I just want to feel better and get things done.