Possible ppd?

trying to decide whether I need to go talk to my therapist or this is normal. I feel a lot of guilt and anxiety and helplessness pretty much every day. I think this really started after we had to go to the hospital because of my son's failure to thrive due to not getting enough to eat. So after that I feel like I blame myself a lot and I do have a lot of negative self-talk but I don't know how to stop it. Do you think this is postpartum depression or something like that or do you think it's just a normal new mom thing?