Do you have a job or a work related project that could possibly require you to work on a Meeting™ night?
Do you have an interest that could temporarily occupy a Meeting™ night? Something like a cooking class or Zumba class once a month, then twice a month? Or a course that you'd like to take, like belly-button contemplation and meditation?
It sounds like it's taking an emotional toll - have you been to a doctor? Maybe you would benefit from some medication to stabilize your mood or dampen the anxiety you have. Toward the end of my tenure with the JWs, I was on antidepressants and anti-anxiety medication, just to get through Meetings™.
Headaches, tinnitus and increasing sensitivity to florescent lighting are also good Get Out Of Jail Free cards to play occasionally. Also contagious illnesses are a good excuse too. You don't want to expose the elderly or children or pregnant Sisters™ to something contagious, right?