Welcome to HCM,
As you are having tonsillitis
, the medication what you have been prescribed by your doctor is an excellent medicine in theses conditions.
As you are getting nausea
following this medicine, definitely you can take motilium
which helps to prevent feeling of nausea.
In addition to this medicine you can take NSAIDs and anti histamines
to control the symptoms.But these medicines should be taken in consulting your doctor.