Tummy , as a term, is high up. if you mean the stomach.
Under the ribs.
This would most commonly indicate gallbladder disease, stomach ulcer, duodenal ulcer or pancreatic disease.
The distribution of this pain and the way it occurred and progressed can be indicative of stones [gallstones] in the ducts, which is dangerous.
Yougurt is not going to help these.
You need an ultrasound today.
Do not wait on your doctor.
Go to the ER or urgent care.
I see no reason for antibiotics, but if it started after these, it can be a problem.
If the pain were lower down...c difficile, which is dangerous. Other problems lower down can be bowel problems like diverticulitis, inflammatory bowel, irritable bowel, and others, including constipation, or obstruction which would be serious.
I am a double board certified US clinical doctor with over 20 years experience.
Find me in medical by request as needed.
OK, so that is an initial answer….
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