Hello,
All the symptoms that your daughter is having are clearly a sign of doxycycline allergy.Doxycycline is not related to amoxicillin and sulfa drugs as it belongs to a different category of drugs(tetracyclines).Side effects of doxycycline are headache, dizziness, blurred vision, body aches, flu symptoms,skin rashes,chest tightness,respiratory difficulty,nausea,vomiting etc.