Well, people certainly do leave them untreated for longer than that, but it's not a great idea. Call up the doctor's office and ask if you can make arrangements to pay once you get your paycheck. I have no idea about Japan's system, but I know at least some doctors in the US are willing to make arrangements like that. I wouldn't have sex while you're still having symptoms, by the way, and I would also avoid masturbating.
Sorry about assuming you were in the US. Does Japan really have no clinics for people with reduced income?
thank you for your reply!
Unfortunately, the discharge came back which is making me very worried.
I don't live in the US and there are no clinics like Planned Parenthood here where I live.
Is 2-3 weeks too long to leave a possible STD untreated?
Any sort of yellow liquid coming out of the penis is highly suspicious. There are clinics, like Planned Parenthood, that operate on a sliding scale fee. They could probably make a prior arrangement with you to pay a little later, once you get your paycheck, but get seen now. They might be better than a primary care doctor for possible STDs anyway. I urge you to look into it.