Hi,
Thanks for posting your query.
I am Dr.R.K and I am pleased to assist you.
I presume you are having this pain in the upper abdomen.
It is difficult to say whether it is due to a stomach bug. Most often a stomach bug causes loose stools along with abdominal cramps. However it is not always a rule. It could be a bacterial stomach bug (also called bacterial gastroenteritis).

Since you have some resolution it is a good sign. For now you should take a bland, non spicy meal for 1 or 2 days. You can take an anti ulcer medication like Prilosec once a day for 7 days without any food.

Since it is a continuous type of pain along with nausea, vomiting, the other possibilities are acute cholecystitis ( gallbladder issue) and acute pancreatitis (inflammation of the pancreas). So if the symptoms persist A complete blood count, a liver function test, serum amylase/lipase and Ultrasound/ CT scan of the abdomen of the abdomen may be done to find the cause. Do not consume alcohol till the symptoms resolve.
I hope that answers your question.
Let me know if I can assist you further.
Regards,
Dr.R.K.