In my teaching days, there was always an outbreak of colds around two or three weeks after term resumed (and that pattern had also held when I was at school, i.e. pre-university).
A sudden change of temperature, (in autumn), proximity to many individuals (some of whom will, most certainly be incubating stuff), skipping (proper) meals - you are not at home, and college, as a new experience, can lead to a more unstructured life - can all leave you more susceptible to colds and sore throats.
Anyway, rest, hydration, hot drinks, and yes, Ibuprofen, should all help.