Dang, that's a bummer. :/
I've still whitelisted you tho, and if you want you can try a few things:
If it's not even launching at all, or crashing during launch, you have a few options:
1. Make sure to give MineCraft more ram:
Under "Launcher Options" , go to Java Settings:
Set it depending on how much RAM you have. If you have 4 GB Ram, set it to 2 or 3 GB at most. If you have 2, try 1,5. Never give it all your ram or it will crash.
2. Under Memory you see "Java Args". Try adding " XX:PermSize=256m " (no quotes). And see if it starts up now.
3. If you are heavily lagging ingame (I assume you tested single player), try on a server. Since when you play on a server your computer doesn't have to do all the work by itself.
4. Add Optifine to the mods. Just don't change any settings on "Chunk Loading" or your client will crash until Optifine is removed.
5. Install Java 8 if you have not updated yet. I noticed some huge performance boosts.
If you're still crashing or something send me a PM and I'll look at your logs