Poorly Paw....

Chester has had a poorly for about 10 days now. It didn't particularly seem to bother him - we thought he had grazed it and bathed it with tea tree oil for a bit. Since yesterday it is obviously uncomfortable for him , so we made an appointment.
Long story short: injections, tablets, drops, cream and a hefty bill and we still have no idea what has caused it.....back in 10 days time :-( we may need to look at our pet insurance.... To claim or not to claim....!??