I agree with Colleen's, @colleenyoung, comments that your worry is understandable, however, until you get a more definitive answer and/or diagnosis, it might be a good idea to try to relax, plan on doing things that will allow you to rest from thinking about your gastrin levels.
I've had three surgeries for a rare type of cancer in the duodenal bulb, however, my gastrin levels were not all that high. In order to diagnose a serious gastric disorder, such as cancer, or pernicious anemia, many other tests need to be done. If you try to put a lot of emphasis on one test result you can create a lot of unnecessary worry and anxiety.
I would encourage you to consider looking for answers and talking with your medical team, but also give yourself a break from worry. I know that this is easier said than done, but it is important for your overall health to take time to relax.
Physical exercise will help you to put your worries in perspective while you wait for answers and a diagnosis. Are there any forms of physical exercise that you enjoy? I'm thinking of taking walks, practicing yoga or Tai Chi with a YouTube video?
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so your saying high gastrin may be cancer? i had 3 caring people in my b12 group say percious anemia. are you saying 153 is not all that high? well i got a message from this GI last night and i really feel his tone was uncalled for saying how much time he spent with me and my issues were not "medically urgent" my gastrin level was mild and not of concern of and my focus needs to be on my mental health and my weight. oh yes my weight thats why the quack referred me to the weight center and kept saying "surgery" umm, i dont think so im not having with all my other issues having weight loss surgery. i have his message i have my lab work lab work he is irritated with me about he said i needed to forget my lab work sure ill forget how dangerously low my iron and ferritan and b12 is ill forget how i want to collapse how i dont have the attention for anything but sleeping. diagnosos it aint gonna come from him im already upset. you just made it worse goodbye