Same, been in semi-forced WFH since late March, and don't like it. It'd probably be fine if I could go to a cafe or had a proper office. As it stands I barely leave the house except to occasionally grab food, and that's not nearly enough. Honestly the last time I felt this bad was my summers in high school where I didn't have a way to go anywhere, or money to do anything with.
WFH is fine for me. WFH without my usual extensive travel and without the ability to otherwise mix up my schedule is tiresome. And I have a good home setup and have been working remote to greater or lesser degrees for around 15 years or so.
Yeah, I think the combination of not being able to realistically take breaks or travel is having the larger effect. My home setup would be fine if I had the room to put my desk somewhere not in my bedroom (it's arguably more comfortable than my office) but the routine of: roll out of bed, make coffee, desk, make lunch, desk, make dinner, couch/desk, desk, roll into bed sucks a lot.
I’ve just started nuking entire two-hour blocks of time out of the day, which is always pre-filled with back-to-back half hour crap meetings, so that I can go out on a bike trail. Most of the time people don’t seem to care, but on occasion when someone asks me why I wasn’t at their precious half-hour crap meeting, I respond that I had some kind of “carers” issue, and if there is anything relevant they need from me to send me an email about it, and I will reply with the info. Amazingly, that seems to effectively address whatever issue the crap half-hour meeting was for.
I'm fortunate to have a forest/river trail I can walk to. So long as the weather is halfway decent I do at least a mile or two (and can do up to about seven) every day. And there's basically never anyone on it.