You will want to speak to your pastor if your question involves you and your health.
Another valuable resource for you is Christian Life Resources. There you will find information like this: “QUESTION: What medical treatment may I in good conscience refuse?
“ANSWER: We should never refuse any medical treatment for the purpose of hastening our death. The time of death is God’s to choose. Under most circumstances we should not refuse treatment for conditions easily and commonly treated like pneumonia, which if left untreated may kill us, for the purpose of hastening our death from a terminal condition like some forms of cancer. We also should not refuse food and water even when given artificially if the purpose is to hasten our death by malnutrition or dehydration so that we do not have to die naturally of some other condition over a period of months or even years.
“Major surgery or other costly medical treatment of our modern age whose only purpose is to extend what God will take away very soon may in good conscience be refused. Limited resources may not make these treatments possible, and the knowledge that our times are in God’s hands does not make them necessary.”