I am not a coffee drinker but I have tried it following others when I was hungry and that made my tummy worse. Try to drink milk chocolate in tetra pack, it's soothing to the tummy. It's my secret remedy. Medicine will make your tummy worse. Stop drinking juice at the moment until you feel better. Best secret remedy is milk chocolate even for ulcers and losing appetite. If you can find this brand in your area or similar ones as long as it's concentrate or creamy if not just eat white chocolate to ease your tummy's pain.
Thanks for the advice @marifa :) I will do that ... God Bless..! :)