I'm starting to lose interest in my University course, what should I do?

I'm in second year university and in my first year, I was somewhat interested in my subject. Half of the subjects did bore me while the other half I enjoyed a lot, but either way I understood what I was doing and I knew how to do those courses. Now in Second year, I started a new semester and realised that I am actually not finding any interest in the courses. I do not understand what we are even learning and I do not have any motivation to study. I am starting to worry that law isn't for me or that it's normal. I can't even tell anyone what we are learning in any of courses.

I feel like maybe I am behaving like this because I recently discovered I have severe iron deficiency and because of that, I would have lack of concentration in that and so on. But it could also mean I'm just in general losing interest in law.

Last year, I have been stressing out whether becoming a lawyer is for me and was anxious about the future. At that time I did enjoy the subject and manage to convince myself to keep going and discover whether I like it or not when I start working. Now, I'm starting to worry the same as I have no interest in the subjects I'm currently learning and that this course is becoming too hard for me considering I am not understanding what I am even learning.

Is this normal? I'm not sure. It's probably nothing but I feel like I need an explanation anyways to justify why I am feeling like this so much.