My lows can vary. Sometimes they only last a weekend, other times they can last for months. I also get that awful leaden feeling and at its worst, I can barely lift a pen to write. Sometimes it takes a med adjustment to bring me out of it, while other times I can simply wait it out for a few days.
Do you have someone who could help you with the shopping this week? Do you have a pdoc you could check in with? At times like this, it's important to have some sort of in-person support. My husband makes sure I'm eating and checks in to make sure I'm feeling safe (though when I'm that leaden, I wouldn't be able to do anything in the first place). If you do feel able to go to the store, try to go with a list and do your best to stick to it. Oh, and don't go to the grocery store hungry - that's the first thing that sets me up for sabotage.
I hope you are able to pull out of this soon.