I remember our prior interaction and understand how you are going to be especially alert to possible symptoms.  The internet has a way of raising concerns related to development of symptoms of HIV and other  STIs.  A solitary scratchy throat is NOT a sign of recently acquired HIV.  A sore throat, in combination with what some call the "worst flu of their lives", high fevers, muscle and joint aches  sometimes a rash or diarrhea along with a sore throat constitute the so called ARS which can be present in some persons who have recently acquired HIV but none of these symptoms alone should raise concern.  I would add that a sore throat is a common side effect of medications often given to persons who have undergone surgery and your sore throat may be related to this.

If your sore throat were due to HIV a 4th generation, combination HIV antigen/antibody test of the sort that is currently widely used for HIV blood tests would be positive.  further these tests are essentially 100% sensitive for detection of HIV when performed four or more weeks after an exposure.  Thus, if your test is now negative, you can be confident that your assailant did not give you HIV.  thus in answer to your specific questions: