Hi willowthewisp,
I'm glad the pharmacist could help. 'Peace of Mind" is a great healer in itself.
It's always good to start taking a probiotic BEFORE starting antibiotics. The probiotic (Acidophilus) will correct your body's Ph and will help ease up the harsh feeling in stomach. And although you may feel sick - drink plenty of water and tea to help flush your system.
I was sick a lot as a child and at 11 years old I was diagnosed with an ulcer from antibiotic use. I don't take doctor prescribed antibiotics anymore (I have gone the natural healing way) but when I did-like you- I always had a bad reaction and they made my original symptoms feel worse. Some of us have more sensitive systems then others.
These days I take Acidophilus daily and it has helped to heal my stomach. Hope you start to feel well soon!