Do symptoms like tonsillitis go away quickly?

Not usually. Infected or inflamed tonsils can be quite painful. A bacterial infection will usually respond in a couple of days to antibiotics - there are medications to minimize the discomfort while the antibiotics are working (throat lozenges, nsaid's, prescription pain medications, etc). Viral tonsillitis requires time to resolve - the same pain meds noted above can help.
Tonsillitis Go Away. Tonsillitis usually lasts five - seven days, whether viral or bacterial. If symptoms persist only a day or two, suspect an allergen or irritant, most commonly mouth breathing with a stuffy nose or a recent cold or reflux of stomach acid.