the pslam of my life

I feel so much like David right now, just crying out to God, How long will you make me endure this? How long are you going to make me suffer in so much pain and discomfort until you save me? I've been praying and praying and praying and begging you to heal me but you continue to let me suffer. I know You won't give me anything I can't handle, and I don't know how much longer I can take this. I am in so much physical pain I can hardly function and I try so hard to just keep going with my life but it's holding me back. The best part, God, is that we can't even find the source of the problem. I know it's there. YOU know it's there. There have been times when I'm even brought to tears because of this. I don't question your faithfulness.. not for one minute. I don't know what I have to do so that you'll take this away from me. I'm really ready and willing to do anything. God, please save me.