Generally with tonsilitis the tonsils are visibly red, swollen and are often covered with white patches or flecks - it's unmistakeable. Also swallowing is virtually impossible.
However back of tongue can hurt and this often extends to the neck also there's often a higher temperature.
However there are so many strange viruses about that it could be one of those that has some tonsilitis type symptoms. If it doesn't clear up in the next day or so I'd check with GP.