I think there's something wrong with my joints.?

You are suffering from Tetanus disease.

As the bacteria (Clostridium Tetani) grow and multiply, they produce a nerve toxin. Then the toxin binds to nerve endings that normally serve to calm the muscles. In the absence of receiving such calming signals, the muscles contract leading to rigidity and become very sensitive to external inputs, leading to spasms.

Also, you may need to know that the symptoms of tetanus may appear anywhere from two days to six weeks after a wound has been infected, but the typical incubation period is 5 to 10 days.

At this stage, you need to go to a clinic and see a physician. Also when you are there, do ask for the following test along with any other examination which the physician may find suitable for a diagnosis:

-Cerebrospinal Fluid Test (To rule out any cause of brain infection, ie, meningitis or encephalitis)

Nonetheless sooner you take care of your problem, the faster you will get better and also dodge any chances of further deterioration in your health due to this disease.

Good Health To You!

Naaaaaaaaaaaaaaaaaaah I had the same thing when I was around your age. I was really scared and stuff. I had what you had, sorta, I went into a chiropractor and cracked my back and neck it went away in less then a day.