Vampy-sorry to say hun but you need to get some help in this situation. SOmeone needs to help you so you have time to get those PFT's back up. Having a child does not have to = a decrease in PFT's, you should not accept that it will 'just happen' that way. If you already know that you have went from 80-60 that is already cause for drastic action. You must call the clinic, you must make up with your mom or someone so they can help you out.
--edited to say: my someone I dont mean getting back with the husband or doing anythign to put your hcild in risk of neglect if there are individuals you know to be incompetent (maybe husband maybe not I dont know) but DONT get back with him just because you are ill.