Sorry to hear that, LittleSin. If it's any consolation, you're probably better off counting calories as opposed to exercising strictly in terms of weight loss. As an example: I weight about 170 lbs. For me, running leads to a net calorie loss of about 100/mile. If I run, say 15 miles a week, it would take over two weeks to lose a single pound! It would be much more efficient to carefully count my caloric intake instead.
Also, regarding cardio: if you can't do anymore, just slow down and ramp it back up when you catch your breath. I wonder if you're putting too much pressure on yourself and going too hard, which is a mistake that a lot of people make. There's no need to kill yourself with the cardio; if you can't go over twenty minutes, slow it down until you can. If that means occasionally slowing down to a walk (or whatever equivalent to the cardio regimen you're doing) that's okay too, as long as you keep on going. A heart rate monitor would help in this regard.
Doing cardio with weights in between honestly doesn't make a lot of sense to me, as the cardio benefit mostly comes from doing it over ~30 min, and lifting weights is an anaerobic exercise. Some people do cardio and weights on the same day, but I've never heard of mixing it together like that. Of course, IANA trainer so take it for what it's worth.
Also, regarding cardio: if you can't do anymore, just slow down and ramp it back up when you catch your breath. I wonder if you're putting too much pressure on yourself and going too hard, which is a mistake that a lot of people make. There's no need to kill yourself with the cardio; if you can't go over twenty minutes, slow it down until you can. If that means occasionally slowing down to a walk (or whatever equivalent to the cardio regimen you're doing) that's okay too, as long as you keep on going. A heart rate monitor would help in this regard.
Doing cardio with weights in between honestly doesn't make a lot of sense to me, as the cardio benefit mostly comes from doing it over ~30 min, and lifting weights is an anaerobic exercise. Some people do cardio and weights on the same day, but I've never heard of mixing it together like that. Of course, IANA trainer so take it for what it's worth.