[Plugin: Jetpack by WordPress] Not working properly

My site went down recently due to some problems with the wrong nameservers in my domain settings. Ever since I’m back online again it seems that I can’t get Jetpack to work again. It gives me a blank page when the plugin is activated or gives me an error message that I’ve reached a certain amount of MBs.

Now, how do I get it to work again? It worked perfectly previously.

oneofpoints.com is my website. The plugin is deactivated.