Speaking as someone with health anxiety, the symptoms you're describing is how I've felt when I've been particularly anxious.
I've undergone a lot of therapy over the years, and there are some things I've found useful.
Remembering that changes in your body are not necessarily 'symptoms'.
Remembering that a set of 'symptoms' are not necessarily related to each other.
Plotting how anxious you feel on a scale (1-100) with 1 being recklessly careless and 100 being consumed with anxiety. Think about where you'd like to sit in that scale (60 is my ideal), and what things in your life would be improved if you could achieve that magic number on the scale.
I have diagnosed myself with bowel, uterus, spinal, and bladder cancer, and at least one type of leukemia in the past year. I'm actually surprisingly healthy.
Notably most of the major diseases I've researched at 4am have been in my abdomen, following a relatively unpleasant csection 4 years ago.
Of course, don't neglect medical investigations, but still, in all likelihood you're probably fine.