If you absolutely *have* to go... have someone rent a wheelchair for you for the day. As a matter of fact, your insurance may very well cover it. If they do... keep it for the duration... BUT someone else has to push you around in it AND you need to use it as little as possible.
As far as groceries... have them delivered. It's been awhile since I lived in FL, but I'm sure that there are stores in the area that do. AmazonFresh may even deliver in your area.
I feel for you. I was on modified bed rest for almost my entire pregnancy, and since I am and was an active person, it not only drove me up the *freakin* wall but *other* people said such cruel things (like I should exercise in order to be "healthy" / aka that I was fat and lazy... even though exercise would have killed my baby for sure, and it would have been 50/50 on whether or not I would have followed... depending on how fast I could be gotten to the hospital, and IF they could stop the bleeding) that I would cry for hours (of course hormones played in, but pain is pain). Bedrest for even a DAY when you don't actually feel sick, is torture. But so is losing a baby. Admittedly one is *far* worse than the other, but at least I could only tenuously wrap my mind around my baby dying when I was going stir crazy (crazy is in that phrase for a reason, because we aren't thinking straight)... even though I'd lost several others
Honey, you only have a little over 2 weeks. Prepare to stream a LOT of movies. Play video games. Read and read and read and read. Make phone calls. Tell your sons every day what "good helpers!" they are (even if they're not, the positive encouragement for every little thing they *do* help with will ease tension & get them to help out more).