Clarithromycin side effects

white tongue, severe nausea, and stomach pains. but i'm taking it with amoxicillin too, (for doudenal ulcer treatment) so it could be both of them.
i find if i eat a little bit at a time frequently, the nausea and cramping goes away and all i have is some mild gas.

headech
hypertension
orang color of urine
nausea
vomiting
upper GI bleeding
asthma
palpitations
heamylsis
neutropenia
CVA
edema
uterus dysfunction

I am not sure if i am having a reaction to this medication. at the beginning of december i was given cefzil for a sinus infection after taking that for 10 days it was mostly better and came back with a headache and dry cough/ stuffy nose. I then got clarithromycin. After taking it twice, it made me really sick with stomach cramps and such. Last night i noticed my face was a little flush and itchy with a red tint to it. Now a lot of my body itches and my face is bright red but nowhere else is red i had a reaction to vancomycin last january and i dont kno if this is an allergic reaction either

Night sweats, and VERY dry throat and white tongue.