Good Morning Shell,
I would suspect you quitting smoking could be effecting your anxiety too. My husband went cold turkey off smoking one time and he had a terrible reaction, very anxious and feeling sick.
May I suggest you stop taking your BP and O2 SAT. You BP is going to change everytime you take it and if you are breathing OK Your oxygen level is most likely fine. Not everyone is a 99% - 100% on SATS
I am so sorry you are havng these problems but try to stay in the moment and enjoy your beautiful children, they are going to have there Mom with them for a long, long time.
Gentle Hugs
Kitt