Need for Balance

So like so many others, I'm adjusting to working from home. And I'm definitely experiencing Zoom fatigue. I'm trying to create a work/life balance for myself within the midst of this pandemic, but I'm struggling to do so. My boss is a bit unorganized, and has tons of last min. requests especially when it comes to meetings. And since I've been working from home, I'm working longer hours than when I went into the office. Is anyone else experiencing this? I rarely get time away from my home office to take an actual lunch break let alone anything else. My co. offers flextime, and my hours prior to the pandemic were 7:30AM-3:30PM though most days I was at my desk by 7:00AM and left around 4-4:30PM. I've tried to set some boundaries while working from home and that has failed miserably. My family understands that I'm working and that isn't a problem, but work is another story. The only area where I've been successful is in not putting my work e-mails on my phone. I refuse to check off hour e-mails once I log out for the day or on the weekends. But I've gotten late meeting requests for 5 or 6PM when I typically wouldn't be working. Or I'll get a last minute meeting request at 12PM for a 1PM meeting. If I have nothing else scheduled fine. But there have been times where the request conflicts w/ another meeting I have scheduled, and when I decline the meeting, my boss asks me to move the other meeting(s) that I've already committed to in order to accommodate the last minute request. So essentially, I don't feel that I can say no to my boss. I worked the 3rd of July (my co. observed the 4th of July the Friday prior since the holiday fell on a weekend) because my boss wanted people on call in case there was an issue during the monthly close (which typically takes place from the 1-8th of the month). I allowed my team to take off because many of them said they had plans, and I stayed on to be available. My boss said we could request another day off to make up for working the holiday. I put in a request 3 wks. in advance to be off July 31st. No response from my boss. At 5pm on Thurs July 30th., my boss requested a meeting for Friday morning (the day I was supposed to be off). I knew I had a flight and couldn't attend the meeting, so I responded saying that I had requested the day off and really couldn't attend the meeting. He responded and said that he forgot and he'd schedule it for Monday. I participated in a 3 hr. training last Sat. Aug. 8th that was rescheduled from Wed. to Sat. morning and ended up having to change my plans for a church back to school event in order to accommodate the work request while still fulfilling my personal commitment. Since I have flex time, if I do end up working 50 hrs. a week (I'm paid for 40 hrs. a week), I try to take an hour here and there to get some of my time back to do other things, but that usually doesn't happen. So Fri. I logged in at 6:45AM because I wanted some uninterrupted time to focus on a reporting project that was due on the 21st. I attended all of my late morning meetings, and finished up the reporting project a week ahead of schedule so I felt pretty good. A friend of mine asked me to a late lunch and I said I was free after 2:30. I had a 2-2:30PM Zoom meeting. I attended the meeting, but as usual, the meeting was starting to run over. I continued the meeting from my phone/car bluetooth and preceded to drive to meet my friend. I left my house at 2:40PM because it seemed it was wrapping up. At 2:48PM, I was asked if I wanted to share my screen to see where to upload a pay schedule (we have gone over this point about 16 times in the past 2 months). I said I could not, and asked one of my direct reports who actually does this task to do so. That was fine and the meeting ended at 2:55PM. At that point I got out of the car, and commenced to meet my friend. Fast forward to this morning, and I get a meeting request for tomorrow w/ my boss (who wasn't in the Zoom meeting) and one of the other accountants who was on Friday's Zoom meeting. As usual no agenda, and no details. My boss doesn't hold any regular meetings even when I've requested it in the past. I hate to assume that this meeting is in reference to Friday, but e-mails often go unanswered, so asking for an agenda or what this is about is probably pointless. This way of working and communicating isn't working for me, and I need to find a way to establish a better relationship w my boss. I partly blame myself for not setting boundaries and so now it's just expected. Is anyone else encountering this? How have you managed to balance things?