last night my 8 month old woke up screaming and crying, then he threw up because of that. And the…

last night my 8 month old woke up screaming and crying, then he threw up because of that. And the whole night to now he's just being crying and crying. He started getting a runny nose so I'm guessing its a flu. I called his pediatrics office but they are completely booked. they told me to go to urgent care but isn't that place for emergencies? what should I do?