Those symptoms don’t seem to be those of an std. If you test negative after 7 months you should be fine. We get sick of different things every now and then and they don’t have to be related to sexual experiences.
HIV test was not necessary after this encounter.
Oral sex exposes you to gonorrhea, syphilis and herpes. 3 weeks after the exposure it's a good moment to test for gonorrhea, even if you haven't had any symptoms (as sometimes stds don't show them at all). For syphilis, your test is accurate, but not at 100%. Most people show a positive result 3-6 weeks after an infection, but in some cases it can take until 3 months, so you should re-test. I would also recommend you to test for herpes. At this point (7 months after the intercourse) all your test will be accurate.