Cat still showing signs of being on heat after being spayed

Question
Hi there, our 18 month old cat was spayed just in November and ever since every 3 weeks she acts like she's on heat for 3-4 days, especially at night. The noise is becoming unbearable and we're very worried about her. the vet took blood 3 days ago and has just called saying nothing was left behind inside of her from the surgery.

Answer
Rebecca,

How old is your cat?

Remember, I am not a vet, but by now, she should not be seasoning. If the hormones are normal, she shoud not be cycling.  You might want to check to see if something else was going on.  You might even consider a second opinion from a feline specialist.

Please let me know what develops.

Best regards... Norm.