I'm having trouble with the following: えらく愉しい事続きなんだ
I don't know the meaning of えらく as I've never seen that word before.
Though this seems already answered, I decided to make it more complete.
"えらく" is a kind of adverb(副詞） that is used to emphasize on something.
Some examples I came up with...
But overall i don't think i hear this very often. If you just want to emphasize, "すごく” or "とても” would be a better choice.