Struggled with a bad habit for years, finally left it behind this Ramadan... but feeling off lately.

So this past Ramadan, I made the firm intention, with Allah's help, to quit a harmful habit I'd been stuck in for years. Alhamdulillah, Ramadan came and went, and now another month has almost passed... and I haven't had a single urge. It's like the desire was just completely lifted from me, subhanAllah. The thing is, even though I'm so grateful for that, I've been feeling really down these last few days. Lost interest in a lot of stuff. I even got my highest marks ever in physics and felt... nothing. No happiness at all. And now, every little thing seems to make me angry, my heart feels like it's racing all the time. It's not about the old habit anymore, Alhamdulillah. I just don't know what's going on with me. Maybe it's a test, or something my soul is adjusting to. Has anyone else experienced this after making a big change for the sake of Allah?