thyroid cancere

My partner was diagnosed with papillary thyroid cancer 4 years ago and after 4 operations , radio iodine and radio therapy  hes has been stable for the past 2  years.  His blood levels started to rise so he was sent for an ultra sound on his neck yesterday and they found something on the scan which wasnt there 4 month ago.  He s due to have  a ct scan tomorrow , neck and chest,  but we will not get the results for that for a number of  weeks.  We are also supposed to be  going on a long haul flight for over 2 weeks and as you can imagine we are both in turmoil do we go or dont we? 

 I suffer with anxiety and it has completely tipped me over the edge and feel as though Im not strong enough to deal with all this again and feel so alone. We both feel like we did when he was first diagnosed 4 years ago, its as though doors are closing behind us all the time.  If it does turn out to be cancer we are also not sure if they will be able to operate because of previous scar tissue, and the said item is near/close to an artery .