That's not the full output. If you want an accurate assessment of the damage and your options, please post the full and unedited output of the checkDB command (or save it to a text file and attach the file to your post if it's a lot of messages)

You can run repair, but you'll lose data (error 823 is repairable). Can't tell how much without all the errors, but probably a lot

Best bet for recovering with no data loss will be to restore a backup.