Hello Lara,
I have found relief and enormous satisfaction in letting go of the income tally. Frankly, it took years... I realize this is difficult when you have committed yourself to portraiture as a career and not seeing the numbers reflect a business model.
As artists, we are here to do special work. The rewards far exceed what numbers will often reflect. Always keep in mind the motivation that brings you to the studio, and let the rest fall. Your spirit, your talent will attract the right clients, and eventually, the right income. Have faith, check in with your 'source', and don't stress!
I know, easier said than done
Best regards and much success,
Stanka