Removed WiredTiger.turtle then all databases are gone

I'm a mongodb beginner from Shenzhen, China, today morning , I ran into a big trouble with mongoDB

I removed the files below for `service mongod start', then everything goes wrong
rm mongod.lock
rm WiredTiger.turtle
It's really a mitaken I've ever made, then I googled it and tried to repair by command ` mongod --repair`,
it seems work, but when I try to `show dbs` via the mono shell, there is no db exits any more,
all my databases have gone...
afterwards, I google the error log many time , and I have to write to you for help, attaching some files if you need.
Please reply to me as you will , I really need your help and thank you very much. Please?

kind regards,

Tang