Just my opinion: Yes, PPA and PPD is real. However, some of it is also situational. How much are you alone? How old is your baby? You deserve to have support. I wouldn't say I had PPA or PPD, but the first day my husband went back to work after both babies, I cried. If you can't be left alone for an hour or two, I would say that's "abnormal," but if you're being expected to take care of an infant by yourself all day and all night while your husband works, then I think that is more situational than a chemical imbalance. (I know you didn't say that anywhere, I'm just saying, if that's the case.)
Also, if you have "anxiety" because you're being expected to take care of a baby while also cooking and cleaning, then that is also situational, I would say. I didn't do any cooking for like 2 months with each child - I had a lot of freezer meals and my husband cooked a bunch of easy stuff. He also handled all the laundry.
It can help to set up a simple routine with your baby so you don't feel so helpless. Just a small thing, like, after they've been up for a hour, you rock them to sleep. Or every morning you take a walk outside.