For like two weeks now i have been feeling pains in my limbs coupled with back ache and neck pain. what could be the cause and what natural therapy?

Many things: There is not enough history to make a guess. Dehydration, viral illness, muscular overwork, connective tissue diseases like lupus, neurologic illness like fibromyalgia can all cause painful muscles. Curcumin and white willow extracts are pain relievers like ibuprofen. Using any without diagnosis is not the best approach. Talk to your health care provider.

Not sure: Those could be generalized symptoms but i would recommend you get in for a good evaluation by a medical physician who is also comfortable referring you to a naturopathic physician if indicated.