Fatigue is one of the most common side effects of radiation therapy. Patients are not restricted from normal activity during radiation therapy; however, they should balance normal activity with periods of rest. Fatigue is typically more severe 2-4 hours after treatment.
Amoxicillin remains the drug of choice for acute, uncomplicated bacterial sinusitis. Amoxicillin is most effective when given frequently enough to sustain adequate levels in the infected tissue. While often prescribed twice daily, it is even more effective if taken in 3 or 4 divided doses.
Amoxicillin is the preferred drug for sinus infections. It takes a few days to feel the effects, just like any antibiotic. You should probably also be taking a decongestant like Sudafed (pseudoephedrine) for the congestion. As for whether amoxicillin is a strong or weak antibiotic: Amoxicillin is very effective in treating sinus infections. Many people think it is not the best or not strong enough, especially because it is is older medication. The bottom line with ALL medicines is give the weakest effective medication first.