You have a wonderful loving attitude
You need to find balance. In order to have anything to give you must first take care of yourself. Imagine if you became that incredible musician you spoke of and crowds paid excellent money for tickets to hear you play! Imagine you do this 44 weeks out of the year.... that leaves 8 weeks. You could spend 2 or 4 of those leftover 8 weeks at a spa, or a mountain retreat, or an island getaway and recharge your batteries. Then spend the final extra weeks in a place you are needed, helping to build homes or bring in the crops, or take a short course to learn be a medical assistant for Doctors without Borders. If you prepare and put yourself in this kind of position, you could have the freedom to do so much.
Have you read any of Steve's material on darkworkers/lightworkers? You may find that helpful.