I have to agree, as a long term sufferer myself (at least once every single year, but not often enough for them to remove grrrr), working through tonsillitis is not easy!
The doctors say that the risk of contamination is very low, but its still a risk. I personally suffer very high fever, shaking, dizziness, alongside the usual not being able to eat, drink, swallow or talk without struggle.
Last time, I only did 2 clients in the first day of having tonsillitis. I was too ill, driving was probably dangerous, and had to cancel clients for the next 2 days.
Antibiotics usually take effect quite quickly, and without, it usually clears in 7-10 days. But I really would advise against them working for at least 2-3 days. Its not fair on them, or your clients.