Aloha Elisabeth,
Those people on this forum who are leaning toward recommending that you push through and get your PhD, could have a good point. Consider that the result of you getting the PhD in physics could have nothing to do with physics per se, yet it could propel you forward in your life. In the 1980s I absolutely hated my voluntary three-year US Army enlistment, and the content of what I studied and qualified for and did, had nothing to do with my future career (in social services). But having that Army experience of learning to kill in combat and extreme physical gusto, and an extremely "republican" political view, strangely enough, opened the door for me to get into social services. Here I am helping the poor in society and being very "liberal" in my politics and generally being the opposite of what I was in the Army. My Army experience set me up for this. I was able to start a successful nonprofit in 2007. Consider pushing through, getting the PhD, then being open to the Universe and feeling the power of the Universe and look for your next opportunity. A few years from now, you may find that the PhD in physics is exactly what you needed and was the key to propelling you into the life that you really want and really need. That could be in physics or in something totally different.
Aloha,
Aliman