I feel so bad that your little Yorkie is not feeling well. If you are short of funds as many have been at times, get done what has to be done within reason and work out a payment plan later.
There are companies/charities that have programs that may be able to help you,
I don't know their names but others I'm sure would and might post for you.
I wouldn't wait for this, it is urgent to have your yorkie looked at by a vet. The payment help could come later.
You are in my thoughts and prayers.
Joan
Also Welcome to YT.