To be honest, Lesley60, in a situation like this I think you need a two pronged attack to support your mental and physical health.
Taking a supplement should be okay but if you are on any medication you should really check with your GP before taking anything - even vitamins and minerals can react with medication.
Try to think of things that you can do that will bring you pleasure to support your mental health - a big mug of hot chocolate by the fire, a good book or film, music, send yourself a bunch of your favourite flowers, a nook in the garden where you can sit amongst the flowers, a hobby, a phone call to a friend. Plan a little something for each day to look forward to. Not being able to move around easily gets depressing and saps your strength eventually
Hope your foot is better soon.