Soft tissue sarcoma v small bowel gist

Hi I had various scans and MRIs including MRI on my liver in November and December plus I had  biopsy 10th Jan. I’m still waiting for the result of biopsy as it’s gone off for further analysis. I have a phone call booked with the consultant 27th Jan. the consultant and my GP are very concerned but I don’t have any symptoms as such apart from feeling uncomfortable I’m my abdomen (upper left side)

at first they queried small bowel GIST now they suspect soft tissue sarcoma. I know I won’t know for sure until I get the biopsy result. 
my CA125 was slightly raised, CA199 was clear, CEA was clear, stool samples clear. 
I can only take this as a real positive but I am also worried sick. 
any advice would be appreciated