ITunes erased my library(!!?!), I put everything back and iTunes is now saying my iPhone 4 is not synced to my library any more. This also happened with my iPod Touch and now iTunes will not update, resync and put all my music back.

I have never used another computer to sync my phone or ipod too. I do not want to lose everything. I am quite frankly at the end of my rope and thoroughly regret the fact that I am stuck with an iphone 4 for 2 years.
Someone, anyone...help??!

Sounds like you've taken the wrong course of action after a missing library error. Ideally you would have just restored a backup at the first sign of trouble.
Each iTunes library contains a unique ID that is also recorded in any device that syncs with it. After your rebuild the two IDs won't match so iTunes will try to treat the devices as "new".
Empty/corrupt library after upgrade/crash
Hopefully it's not been too long since you last upgraded iTunes, in fact if you get an empty/incomplete library immediately after upgrading then with the following steps you shouldn't lose a thing or need to do any further housekeeping. In the Previous iTunes Libraries folder should be a number of dated iTunes Library files. Take the most recent of these and copy it into the iTunes folder. Rename iTunes Library.itl as iTunes Library (Corrupt).itl and then rename the restored file as iTunes Library.itl. Start iTunes. Should all be good, bar any recent additions to or deletions from your library.
See iTunes Folder Watch for a tool to catch up with any changes since the backup file was created.
When you get it all working make a backup!
Alternatively, for each device...
You should be able to transfer your purchases into a newly authorised library, backup the device, recover any non-store purchased media with the tips in  this post from forum regular Zevoneer, (skip this if you've already got all the media) then restore the device from the backup you just made. That should  preserve all your data and switch the assocation of the device to the new library. I've had positive feedback on this method from other users but I've never had to test it personally.
tt2
Message was edited by: turingtest2

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