Thanks everyone who answered the previous post, you were absolutely right.
Saw a video about slow jogging somewhere in the community this morning. Actually, during my previous runs I had an impression of doing just that, but it was before watching the video. So slowed down today (still, in my opinion, not achieving the degree of slow shown in the video) and, unsurprisingly, had no problem completing W4R3.
Also treated myself with starting "Zombies, Run!" right now, feeling the urge of some positive reinforcement (I use a minimalist application for timing, not the famous podcast). Will have to think of something else to celebrate graduation, when the day comes.
Unfortunately, I've had a harassment attack on my way home. Last time it happened, I was still a teenager, and that is not something I know how to manage. So quite shocked by that, but happy about the actual run.