Hello,
Thank you for asking your query.

First of all with the available information the tightness of the throat does not seem related to the stomach problem. It seems nonspecific and you need to worry about that only if it is not getting cleared by a couple of days.
Now coming to your abdominal problem. In general abdominal problem are difficult to diagnose even with a physical examination. But from the available leads in your description this seems to be an inflammatory reaction to an abdominal infection (bacterial/viral). It will not be specifically say which bacteria or virus. There is nothing to worry about this though. There are numerous bacteria already in the stomach and sometimes when new bacteria reach the stomach via food, some disequilibrium can happen and it may manifest as these symptoms.

This should get resolved naturally in some time. You can take probiotic drinks or capsules which are easily available and this should help. If the problem is still persisting beyond a 3-4 days you may visit a Physician.
Hope this helps

Thank you