HELP!! I'm desperate for advice!!?

Sorry this is so long, It all started 3 years ago when I gave birth to still born twins at 8 months, since then we tried and failed to fall pregnant again and were told because of my partners sperm we were extremely lucky to have fallen pregnant the first time and it would be highly unlikely it would happen again naturally, although I am very young we were aloud to start IVF because of the length of time we have been together and living 2getha etc (I am 21 and we have been together for nearly 7 years) the 2 IVF attempts we have had, have failed, so since then, I have been diagnosed with cancer, I have just had a tumour removed from my gall bladder and I have 1 on my liver. I am due to start chemo on the 24th of this month, I am also currently taking my exams in the hope of becoming a teacher to disabled children, which I am really struggling with given everything that is going on, to top it off my fiance has just been told he MAY have a brain tumour (we get the results next week) AND we are due our third and final course of IVF when I finish chemo as it can't be done simultaneously! I just don't no what to do, I feel unbelievably physically drained and have no clue what to do! Any advice would be sooo helpful, thankyou for taking the time to read x