Being bored of your job and not being able to enjoy it may be affecting your focus at work but that does not reflect on your actual ability to do your job. You have done it for 15 years and you've done it well for a very long time. We all lose focus. We all get bored. It's okay. Take some time for yourself and as you reflect and relax you'll find your confidence. If you remember you had it once, know it's just buried under the anxiety...It's not lost.

A few exercises I have done to help myself are:

Listing 10 strengths and keeping it as a Self esteem inventory..It took me days to finish so don't give up making this list...I still only have 8 listed so make sure you don't give up trying to find all the strengths you have.

Listen to Affirmation podcasts

Write a letter to my future/past self