Thanks for the query.
The symptoms you mentioned are related to anxiety
Twitching in stomach, sweating etc are may be related to your anxious behaviour.
Another possibility is hyperthyroidism
Probably your doctor wants to get a blood test
done for this,
Please get it done.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.