SC2: Lost CD Key but have CD. H.E.L.P!

Here's the whole story. I bought SC2 for myself and my brother to play on. My computer is old (I still use it, even while I'm typing now.) so I installed it on my brothers computer. We used his email and everything. One day, he loses the disk. I tore up my house looking for it but never found it. My brother then deleted SC2. A year later I found SC2 under a bunch of stuff under my bed and was not scratched. I ALSO found the cd key but wait, heres the problem. When I accessed the account, (Didn't remember pass for email so I changed it to mine thru security question) it said my account was under surviellance by Blizzard or something like that. And SC2 was gone. CD key said it was used. Which it was. I am getting a new computer soon, I will build it. The games I want to play and max are Mass Effect 3, BF3, TF2, Skyrim, Fallout 3, SC1 (I still have it) and SC2.

Is it possible to fix this problem. I contacted Blizzard but they were jerks and refused to help.
Please H.E.L.P