Getting sick in Japan, or anywhere else in the world, sucks. Getting sick while abroad is the very worst. Thankfully, cities like Tokyo provide all kinds of services for foreigners. If you get sick in Tokyo, the Tokyo Metropolitan Medical Institution website is very helpful, to find nearby clinics. They also offer a translation service.
As for myself, I'm convalescing. Turns out those million of medicines actually work for a tonsillitis gone terribly wrong.