Prayer for upcoming tests

I am requesting prayer over some up coming blood tests! My last blood test showed that kidneys had lost a couple points in functionality,...I am feeling somewhat apprehensive about this next round of blood work,and having some feelings of anxiety at the moment! I am doing my best to make healthier choice eating habits,..I no longer drink pop,or eat VERY LITTLE bread,if none at all,..haven't in a year and a half's time! Not diabetic,..at least last test did not indicate that I was. I just want to ask prayer that God will give me a peace and calmness about this as I must admit,..I am a bit concerned.