Oh my GOSH, you've had a hard time of it, @philcarly xx I am so sorry you've been so crook & having a broken rib from coughing is NO fun. :(
Re your question - I think you've almost answered it yourself .... and working as a medical receptionist will continue to put you at risk of catching something from the patients attending :( Your weakened immune system makes you more vulnerable :(
If I may ask - how old are you? Do you NEED to work right now? Sometimes your insurance policy can allow you time off 'on half pay' or similar .... If you can afford to take the 12 months off to recover fully (hopefully) it will DEFINITELY be to your advantage! If you feel better 'earlier', you can always return to work earlier - or like @Blossom1961 - work as a casual, if you feel up to it!
Your exhaustion and fatigue needs to be addressed ... my suggestion would be, if you can afford to do so - take that year off. Your health is worth more than any job xx
take care