Can't access website

I can’t seem to excess my website from my computer. Apparently, it is accessible from other computers. But I can’t access it. I can access it via a proxy wall but that does not allow me to login and access dashboard.
Please help me out!
URL is: https://www.digitpanda.com

Note: The problem started today only. I installed WP Super Cache after which it was working fine. Then I removed addthis.com’s sharing and added Digg Digg. Also, today I added Pinterest follow button and Facebook Like button on top right.

I don’t understand which one could have caused the trouble. I can’t access my website at all. Any url of that domain gives a blank page!