the period of one year

difficult, hard / terrible / serious, grave

very, greatly

disaster / difficulty / dreadfulness

お世話になる: to be much obliged to someone, to be indebted, to be grateful, trouble someone

世話: care, looking after, help, favor

お世話になりました, 御世話になりました: thank you very much for everything, I'm very obliged to you (for what you've done)

take care of, attend upon

to be much obliged to someone, to be indebted, to be grateful, trouble someone

form past of お世話になる