@Blahblahblah40 Oh that's rubbish, I totally sympathise. I'm the only adult in my house as well and it does make things trickier. Here are some things I did to get around this:
Bung pup. Find a good petrol station. Park car outside, with pup inside where you can keep an eye. Turn off car alarm but lock doors. No good if you don't have a car of course, and no good for anything other than getting supplies!
Pay someone to babysit her for a few hours. Found them on rover.com. Might not work if you're not in a very dense urban area or money is really tight.
Deliveroo groceries. Saved my bacon on many occasions.
All the above has added ££££ to my expenditure but has probably been worth it/ necessary.
I honestly never thought I'd be able to leave my dog, she just used to bark in such a piercing way, and so incessantly. And then suddenly, it just... stopped. I did nothing really, I think it was that she was growing up a bit, and grew in confidence. I'd take it as a good sign if your pup ever potters off to another room alone. Or even the other side of the room, away from you.