Drinking boiling hot tea?

I poured water from the kettle into a thermos flask and put a tea bag in it.

when I forgot myself a few minutes later and took a sip,

(due to the thermos coating, I didn't notice the temperature on my lip)

My throat and sternum felt raw and hot. Shortly afterward, I drank about 2 liters of ice-cold water.

Now, 4 hours later, it feels better again, just a little hot down my throat.

Do you think this is okay? I know, it's a stupid situation, but it's happened. My voice is barely raspy anymore.