Anxiety, Fear, and Doubt

Hi – This is a model that seems to be a pattern with me, but I don’t recognize that it’s happening until I have a horrible back ache or headache. Are there specific resources that focus on anxiety and fear? Also, I’ve tried changing the thought to “I can do the work” or “I am going to succeed,” but I have a hard time believing it. Sometimes it feels better to run towards the task that I am afraid of and just tackle it, than to try and change my thought to something I don’t really believe yet. Any advice would be much appreciated. Thank you in advance for your help!

C – External Audit or Regulatory Exam
T – I can’t do the work that is required. I don’t have enough time to do the work. I’m going to fail.
F – Fear, anxiety, tense muscles, back ache, headache
A – Urge to eat sugar
R – My fear and anxiety increase and lead to less work getting done (not get required work done) and more likely to fail.