ANSWER: His stress is mostly psychological, and he should find something fun to do until the game.
EXPLANATION: Liam is suffering from a last minute stress which is quite normal when the person is going to perform on stage or on field. This stress sometimes gets on nerves and affects the quality of performance. At this moment, Liam should concentrate on something fun before the games as it will keep him busy and will also keep him in happy mood. Liam is confident about his shape and his performance of his team so it won't affect his performance on the field.
Practice different positions and actions, regularly practice, practice with others, don’t overwork, eat proper foods,
On a simplistic level, medication should be taken for the prescribed duration and not less, irregardless of the fading of symptoms - many STIs are asymptomatic or have latent phases in their progression anyway. Lots of medication is given to reduce the effects of incurable STIs like HPV ,HBV or HIV (Viral). However antibiotics are given to bacterial infections like syphilis or chlamydia which can remove the pathogen, thusly the presenting symptoms. "Medication" is a broad term ,as is "STI", so unfortunately there isn't a neat, all-encompassing answer as there are too many variables . Play it safe and say, "No" as incorrectly taken medication is harmful not only for the patient but the wider population as it increases the risk of pathogen resistance.