You have already shared all details clearly, and medically there is no significant
HIV risk in your situation. Condom was used, exposure was protected, and partner tested negative at 54 days, which is strongly reassuring.
Your throat symptom is a local tonsil issue, not related to HIV. HIV does not cause isolated white patches that improve with gargles and antibiotics.
Right now the main problem is health anxiety, not infection. Repeated worry will only increase stress and body sensations. Trust the facts you already know.
If you still want 100 percent confirmation for mental peace, you can do a 4th generation HIV test at 90 days, which will be conclusive. Otherwise, you are safe.
Stay calm, avoid overthinking, and focus on normal routine. If anxiety continues, you can consult me or text me anytime for reassurance.