I've been reading the last two posts and feel for your pets.
I have a chocolate lab of 10 yrs who recently had to get spayed due to a sudden womb infection. It was terrible to go through. We almost lost her.
since the operation she is having trouble holding down her food. Sometimes she will go more than a couple of days without puking on the floor. Most days, however, she is puking once a day. She already is being fed 4 times a day to combat this since the vet thinks she had a chronic stomach infection. So, yes, tomorrow I also will be calling the vet for another appointment.