This! I had the same issues during high school. First it started with unnerving belly issues, bloating and so on. It turned out to be some virus, what the doctor concluded. It just took me to recover a bit, it stopped gradually. But that really impacted my self-esteem, all the noises my stomach made and the constant thinking how will it be today, and a few episodes of severe lightheadedness. I started getting psychosomatic symptoms after everything cleared, when I would start thinking of it, basically the reverse.

Today I have some residues, I think. Bursts of hypochondria here and there, psychotherapy helps me keep it under control. Although a lot more things went into developing that one :-)