WWhatever the time, day or night, vets have an emergency out of hours service. You can speak to and explain symptoms to avet who wil tell you if you need to come in as an emergency or if they need to come out and do a home visit.
It is FAR better to look/feel a bit silly in front of your vet because there really is no 'emergency' than to have a sick, dying or suffering pet. If you thought your child might be sick would you worry about looking silly or would you wait until morning to take them to A&E?
Not getting a sick animal to a vet is neglect, pure and simple. I never gfail to be gobsmakced by teh number of people on various forums that I use that aren't aware their vets have an out of hours service or for whatever reason, best known only to them, are reluctant to visit the vets with their animal.