Acidity and gastritis will lead to left sided shoulder blade pain. Skipping breakfast will just aggravated the problem. Even if there is work pressure, try to carry at least 2 biscuits or nuts for morning. Continue with rantac or alternatively you can switch to Pan-d 1 tab before breakfast for 1 week.
Next Steps
drink plenty of fluids and avoid oily fried food.
Health Tips
if the pain still persists or more than 10 days , get an ultrasound abdomen done by your nearby physician .