So today I fought a frost dragon and a fire dragon at the same time. Is this normal? Both appeared simultaneously when I was walking around somewhere between whiterun and kynesgrove.

I've heard from a few people who have had 2 dragons at once, or 2 dragons attacking two different points at once, but haven't seen it myself.

Yeah, pretty much I'd say. It's random. Had two in a row yesterday, although the second one was circling that mountain and I had to walk a few meteres to lure it down after killing the first.

I had the pleasure of fighting an Elder Dragon and a regualar one at the same time. That was really hard toput it like that.

The roar was deafening lol

Yea it's normal i had that while i was traveling to Riften i screamed like a little girl but after a few load i managed to beat them