No sore probably means no herpes.
You should really stop using a perfumed shower gel on your genitals. Perhaps that's contributing to your condition.
A headache, sore throat and general malaise, can be from so many things - allergies, covid, any number of upper respiratory illnesses.
Since you had unprotected sex, it's not unreasonable to test. Your symptoms don't sound like herpes, and a blood test might not be positive yet anyway, but it might be a good idea to get tested to put your mind at ease.
Because you get so paranoid about these things, maybe you should be really careful to not have unprotected sex. No judgement - just saying that it might benefit your mental health to wear condoms.