The headaches, dizziness and tiredness may be due to an underlying viral flu and may not necessarily be a result of the the antibiotic. You can try over the counter medication like tylenol. I would also advice adequate rest. If these do not help, you may need to consult your doctor to rule out a sinus headache and prescribe appropriate antibiotics for the infection.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.