[michka]

Hi Cool Breeze. It is difficult to answer because I am not in your shoes but I am close to you. (age,stage IV liver mets, 2 boys, head of household). What I understand is that you love your job and that you are worried about loosing a salary. But you feel so tired.
There is another parameter: how will your keep your spirits up? By working and keeping your social contacts or by staying home and organizing your life around your family? It is key. Today you feel very tired but maybe in 3 weeks or 2 months you will feel good. Your immune system will not resist if you are tired but will not resist if you are depressed.
If you want to work maybe you could negotiate 2 extra weeks even if you are not paid and/or for the first month part time. (3/4 or 1/2 time?) Do you think this is acceptable? Then you will feel for yourself if you can do it. No need to decide now. Wait for the end of the month. Then if you feel it is still going to be difficult, talk to the school asking for a little less work for a short time.
If you are tired you can always stop but you will have no regrets.
Some of us Stage IV consider that it is time to change lifestyle and others consider that they are going on with their lives because they have a chronic disease and not a death sentence. And some don't have a choice of course but to continue working.
As stated before, you still have a few weeks to recover a little and decide.
Stay strong. Michka