You don't know if the infection is viral or bacterial, and if bacterial what organism is the cause. I suspect you have a few capsules of amoxillan around and taking a "few" is the absolute positive worst course of action to take. You will end up (if the infection is bacterial) with an infection resistant to antibiotics. See a physician for a proper prescription and antibiotic. Many physician choose zithromax (the Z-pak) as the broad-spectrum antibiotic of choice for a lung infection.
Hello and hope you are doing well.
Agree with the above suggestion that taking a random antibiotic will not help with any infection. The commonest pathogen (agent) causing throat infections is a group A Streptococcus bacteria. Besides this Group B Streptococcus, mycoplasma, neisseria and cornybacterium are known to cause throat infections. Other known pathogens causing infections of the throat are viral and yeast (candida). The antibiotic of choice for a streptococcal infection is penicillin but azithromycin is also effective.
Hope this helped and do keep us posted.