I got strep several times in my late teens and early 20's. Each time it made me sick enough to go see the doc, and each time he took a throaat swab to test and sent me home without meds. The results of the tests eventually said "strep" but by that time I had always gotten better. It got so that I knew exactly what I had simply be the combination of symptoms...slightly funny "taste" in my mouth, whitish appearance at back of throat, soreness, etc. But they always made me wait it out.
Finally, at around 25, I got a bad case, the worse I had ever had. I went to my then-new doc and explained my past episodes and why I thought my self-diagnosis was correct. I don't recall if he performed the test, but he gave me a prescription for whatever stone-age antibiotic was being used back then and the thing cleared up within a few days, and never re-appeared.
Hopefully yours would respond just as well.