I have no fever but experiencing chills with sweating. i am weak and very tired, back surgery was performed 2 month ago. don't know if this warrants?

No fever is good,: and makes it less likely that anything serious is going on. But since you just had surgery, you should be extra careful and make a follow up appointment with your surgeon as soon as possible. Did you just wean off narcotic pain meds? That can make you sweaty and tired. Are you in a lot of pain? that can do it, too. If things worsen while waiting for your surgeon, to the ER.

Be seen: I would definitely be seen immediately. There are serious complications. Such as a deep wound infection, that can initially present just as you are describing.