Straight answer: itching alone, starting 5 months after the exposure, with no rash, no redness and no swelling, is not an
HIV symptom. Acute HIV shows up 2-4 weeks after exposure as fever, sore throat, body ache and swollen glands, not isolated night-time itching. Your exposures were with a condom that did not break, and your partner tested negative. Night itching at a fixed hour is usually dry skin, dust mite or fabric allergy, or plain anxiety-driven scratching. Do this and close the chapter: one 4th-generation HIV antigen-antibody ELISA from a proper lab now - it is conclusive beyond 3 months, and get HBsAg, anti-HCV and VDRL in the same sample. Meanwhile use a plain moisturiser at night and levocetirizine 5 mg at bedtime for a week. Get the ELISA done and book a Practo consult with me with the report - I will close this properly for you.