It is great that you were able to see a doctor.
It is difficult to diagnose conditions over the internet as I would need to see it, take a medical and sexual history and do some tests. Some sexually transmitted infections (STI) can be passed with unprotected oral sex but it is also common for them not to show any symptoms.
I would suggest going back to your doctor and discussing your concerns with them. You could also see what STI tests they have done for you.
You could also get a second opinion from another doctor.
It is common for people not to feel comfortable discussing their sexual history with their family doctor. In this situation I usually recommend that they go to an STI clinic or a different doctor where they feel comfortable discussing this as it can help with working out what could be causing the symptoms. They could also do all the STI tests for you as well. If the STI clinic does not think it is an STI and all your tests come back negative you could go back to your family doctor reassured that your symptoms are probably not caused by an STI.
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