... And 3. ... Qe4# 
What should I do in this situation?
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There are general rules in chess such as do not move your queen early in the opening. There are also exceptions to every rule and 1. e4 d5
2. exd5 Qxd5 is one of them. This opening is perfectly ok until and unless someone refutes it--but I have not seen a "refutation" yet that is a real refutation and not based on bad moves by Black.
Since you can't refute good moves, only bad moves by Black can be refuted. Fortunately, he's already played two of them and will probably play more ;)
paulgottlieb wrote:
We're all joking here, right? I mean, we all know that thr Scandanavian Defense (or Center-counter) is a very old, well established opening and that 1.e4 d5 2.exd5 Qxd5 3.Nc3 has been established theory for over a century
I refer you to my earlier post (#12)...
"I'll bet this is all in a book or something somewhere..." 
Using almost any opening you can say White is slightly better in the opening.
Wasn't there somke anonymous player on the net about 5 years ago who was beating masters by opening 1. f3 2. Kf2
First I'm hearing of it. I thought 3.Nc3 was a novelty introduced by Kasparov in 1991.
Of course, the old main line was 3. Ke2 Bongcloud style.