Initially, it sounds like a stress response. If you're very anxious, even subconsciously, about the interaction, then your body will elevate temperature, blood pressure, heart rate, breathing rate etc. It can be very subtle or very extreme. Also, have your vision checked. The dizziness and headache could also be eye strain. I recommend first seeing your doctor to rule out medical issues. If it is anxiety, your doctor can help with either an anti-depressant or ant-anxiety medication.