Itunes needed to be reinstalled on my computer. I want my library but when I go to sync it says it's already synced with another itunes library do I want to erase and sync?  Do I?  Will everything be lost?

Someone please help

There isn't a seamless solution unless you fall asleep and wake up when computers have reached the Star Trek level of development.
iTunes does not actively scan for additions to the media folder.  The only way a library knows something has been added its if that particular library did the adding.  If you add with one library and then start another using the same media folder it won't see the addition unless you also add it to that one.
You could split your media storage with a single library, keeping some on the external and some on the internal.  If the external is not attached and you try to play a song iTunes will present you with a ! saying the link is broken, but if you quit iTunes, attach the drive and restart the links should fix themselves again.  There isn't a way to get one iTunes library to automatically update another except what might be possible with Home Sharing and I don't know if this extends to your particular application.  I believe it might also end up duplicating media like crazy.  I can't run Home Sharing so I can't test it to see exactly what is possible.  It may require you be running the libraries from different user accounts.
You could search on the web for third party tools that might synchronize multiple libraries.

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