Cannot add new plug ins

My site was running slow, so I deactivated all my plug-ins. In the process I accidentally deleted Jetpack (ARGH!). My site is back up, but the dashboard is extremely slow. But when I go to try and re-install a plug-in or get a new one I get an error message that says:

An unexpected error occurred. Something may be wrong with www.remarpro.com or the server’s configuration.

I have contacted my host, (Bluehost) and they don’t seem to think the issue falls there.

Help!