My advice, as someone told she "couldn't work anymore," small amounts add up so put what you're doing in buckets you can handle and time allotments you can do and be happy when plants don't die and you pick your first pepper, radish, tomato, whatever..Small amounts of time, small amounts of lifting, small amounts of water carried , add up and the next thing you know, you're eating what you grew. As for weeds, a lot of them are edible.
Look into it. Maybe mother nature is providing for you and you just don't know...yet.