If you have a staph infection, which is unlikely, but if you do, yes, it's serious. If you have a UTI it can go away on its own if its minor and your immune system is able to handle it but if it sticks around and gets worse then of course yes it also can be serious. Again unlikely it's gotten into your kidneys or your scrotum if it's a UTI, but even more obviously if you have a kidney infection that is also very serious. Now, since you're self-diagnosing, you haven't the vaguest idea what's going on so of course you need to see the doctor to find out. If you are seriously having kidney problems and a staph infection and you really truly believe that any reason you're not typing this from the ER?