The only risk is if the condom breaks. I can't tell you why people post inaccurate information on other websites. That is what condoms DO - they protect you from HIV infection. People don't get HIV when the condom stays intact.
The original answer you received was accurate. People don't get HIV while wearing condoms unless the condom breaks WIDE open. Whatever your symptoms are, they aren't due to HIV as you never had a risk. You should definitely see your doctor if you aren't feeling well.