Hello Friend, Good that you are seeking a help here. Anxiety is not just a mental disturbance, it also Influence bodily function and cause nervousness, sleeplessness, stomach aches, body pain etc.. What you are experiencing is something similar. Better address the root cause for your anxiety and that should help your problem. You may need a guidance of psychology counselor to figure out the reason and possible solutions. Feel free to reach out to me online for further evaluation.