You said its been down for 3 days, so if you have do this from two weeks ago, at least you can get you newsfeed back, will you lose some data, yes prob, but what is the other option, to be down a few more days.
Just bite the bullet,
If you have a backup before this hapened, just go into your DB and drop all the tables, then find the sql file on your backup and import that, you will lose a bit of data. But you will be back up again, remember when you do this to disable your plugin right off, because the backup will have it enabled probably.
You learned a valuable lesson here, one we all have learned the hard way, backup, backup, backup. 2 weeks and 2 days is not enough, it needs to be back up every day, then at the end of the month you keep the first of the month and the last of the month and archive those for 3-4 months then you can cycle those out.