Your cat may be responding to your anxiety-levels being high...
I don't think that a week or two of not feeling well means you have cancer all of the sudden... I hope you're not thinking along those lines, but if you are, being a fellow-anxiety-sufferer, I understand.
(((Big Hugs)))
If your stomach persists, ask to see your GP if the GI is not responding. Maybe they can get you in to see the specialist...
In the meantime, is there anything natural that you can take to help? Ginger, ginger ale, plain rice??
Also, if your nerves are bad, place your hand on your solar plexus and lightly push - it's a form of therapeutic touch that should help you relax and feel cared for.