Hi everyone looking for some advice here as my head is all over the place.

my dad has cancer of oesophagous, lungs and liver and in January after failed chemo was told has a month left and life expectancy very short and will deteriorate quickly. In the mean time he has had good and bad days, bad days due to being very short of breath, vomiting and coughing and no energy. However the past week he has been great thankfully and no breathing concerns. I am an only child and I do the caring for my dad as he lives alone and ultimately all the desicions or responsibilities are down to me. 
 

my main concern or reason for this post as I feel worried or uncertain what's the best thing to do in this case with my work. I have been off for a month now and my doctor gave me another month line. But have a long term sickness meeting at my work soon. I know things can change suddenly but as my dad has been really well this past week I feel like a fraud being off my work. And at the back of my head I'm thinking what if they have got it wrong and it's way longer time he has, I hope it is but am I being silly thinking this? And in the back of my head I'm feeling guilty and thinking at the other side I won't be able to take any time off. 
 

my dad isn't accepting any help from district nurses or macmillan so I'm the only one going in to see him in which I am there every day but u also have this feeling of fear that I am going to find him. 
 

im just looking for some advice, if anyone else has had similar worries or am I silly for thinking these. My minds all over the place right now. Thanks