On the second dose of the Doxycline 100 mg po BID x7 days presrip...

On the second dose of the Doxycline 100 mg po BID x7 days presription, I felt nauseous and vomited. I now have a headache, feel somewhat nauseous, have and "ache" in my abdomen, feel slightly dizzy/fuzzy and have a dull headache. The medicine was prescribed as a prophylactic antibiotic in preparation for a gynecological/preobstretrical procedure called a hysterosalpingogram. I have no plans to continue w/this medicine as I am intolerant of these side effects. It feels like putting poison into my body. Hope to feel "normal"/well soon, Eliza