You could probably use NRC Emotion Lexicon[1] to categorize the titles into different emotions and sort it like that, as well and give it some normalized emotional score/category for X. Then use logistic regression for Y being before/after lockdown or linear regression for Y being (current_date - lockdown_date). The linear regression will assume that things get linearly worse over time (it can be smoothed out better probably).
1: https://saifmohammad.com/WebPages/NRC-Emotion-Lexicon.htm#:~....