If cell phone use is causing you all of these symptoms, then obviously you need to discontinue their use.
There is no medically established link between cancer and cell phones, but since cell phones are a relatively new product, no one can say what the medical opinion of them will be 10 or 20 years from now.
Many people use a wired headphone set, so they don't have to hold the cell phone directly against their head. Whatever you do, don't use those wireless headphones that are literally screwed into your ear.
