After erasing 200 GB I need to repair it using the Recovery HD
No your Mac will not reset all you files. It is just maintenance of file system and not your files.
No it will probably not solve your problems. It even can make matters worse on filesystem level. Or just ask you to do the same i.e. Repair Partition.
You should just do what it you are asked — boot to Recovery HD with CMD + R on startup and Repair Main Partition.


Word of caution: It might be that you HDD is failing so do Time Machine backup or other form of backup before going futher.