Hello, thanks for the query to H.C.M.C.
After surgery there is chills and increase in heart rate
Fever with chills when occurs naturally heart rate increase due to high temp.
As far as concerned about mild increase in thyroid
hormone this is a normal phenomena because stress
strain , wrath also have impact over thyroid hormone , so pl don't worry.
Now please get in examination of blood for any increase in T L C ( WBCs) and ESR.
If there is septicaemia
than both above mentioned tests would be abnormal and deal accordingly.
Blood for M P ( malarial parasite) is also important as there is chills and rigor with fever is there.
Urine culture is must to rule out Kidney involvement.
So please take care. REGARDS .