How to recover corrupted Bitcoin-Core blockchain?

How to recover corrupted Bitcoin-Core blockchain?

I recently experienced a I/O error resulting in data block corruption or index corruption cause bitcoin-qt wasn't quitting so I forced bitcoin core to shutdown without killin it properly. I checked the harddisk.. when I restarted Bitcoin-qt it asked me a question:

Error opening block database. Do you want to rebuild the block database now?

Answered yes but when Bitcoin core came up I realized that I was 4 years back to synchronize with the blockchain. So I immediately stopped it again to look for more information before proceeding for safety

I found the relevant command in bitcoin-core options to rebuild chain state:

bitcoin-qt -reindex
bitcoin-qt -reindex-chainstate



Found this bitcoin.se answer Bitcoind --reindex vs starting allover again but made me more uncertain on what to do next in order to retrieve my database without downloading the whole blockchain from the start

What would be the best and fastest possible ways to rebuild/recheck my blockchain from Bitcoin-qt?

What is the difference of use between of bitcoin-qt -reindex vs bitcoin-qt -reindex-chainstate?

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