What was your temperature last night?
Do you know how long before you took your temp you had aleve?
It sounds like your fever may have been breaking.
The antibiotics are starting to work and you and getting rid of the infection.
It is possible that you are a little dehydrated and that is causing you to be chilly along with if you have any flu bug left.
Flu can't be treated with antibiotics so it is possible to have flu and pneumonia at the same time.
Drink lots of fluids and keep an eye on your temp.
There isn't such a thing as a reverse fever but now if your temp goes below normal and you are having chills you need to get to the doctor right away.( temp 97 and below) as this could be a sign of blood infection ( sepsis)
I know you are feeling bad.
Make sure you are getting plenty of fluids.
You will be feeling better real soon.