One thing I have slowly and painfully learned in my decades on this planet is that not everyone thinks like me, so this advice may be useless. But I think more people here on WP think somewhat like me than in most populations, so this might be useful.
My interets change periodically, but they never really go away. What I mean specifically is that , for example, I am no longer into dinosaurs the way I was when I was a boy, but I still understand exactly why I was so into them then and I am no less interested if there is, for example, a documentary about a new find or a new understanding (e.g., the preponderance of feathers on dinosaurs)--that means if I watch that Nova special on the new fossils from Mongolia, I get excited, as of old.
The thing is, my newer or most current interest takes precedence. Meteorology currently has a stronger pull than dinoIasaurs. I have no time for dinosaurs while gathering data on super typhoons, for example. But those old pathways are dormant, not dead.
Think about the patterns in math that most thrilled you when you were most into the subject. Explore related phenomena. Are there problems in geometry, statistics, or physics that are related? Have you read Max Tegmark's latest book?
Is there a way to visualize the structures and relationships in your area of interest?
If you explore these dimensions of the subject, I think you will find that the old connection is still there and it will burn fiercely in your mind. Television can be a powerful diversion and sedative, but the pleasure it offers is a pale shadow of the intense experience that comes with letting your mind embrace the relationships of math.
Give yourself time away from TV and rediscover the things that enthralled you about math. They almost certainly will again. Think about your peak experiences with mathematical discovery and exploration. Surely there is little in life that compares to that kind of awe, thrill, satisfaction? TV can offer nothing of this depth or grandeur.
Well, that's how it is for me, anyway. Fully embracing my mathematical and scienctific interests (sometimes programming) has provided experiences I can't explain to those who haven't been there. Think of a fourteen hour multi-peak orgasm, I'll say. Or that sensation of the most delicious bite of food you ever had, but lasting for hours or days. Can TV give you that?
The pure source of that joy is always there, you have but to let yourself get into it.
Good luck! TV in moderation should be ok, after you get back on track.