Many overweight people have common problems when they lose weight. Endless strenuous exercise does harm to the body, which is called excessive exercise. If this happens after exercise, you will recover after getting enough rest.
Running and cycling can be practiced separately. There are many aerobic exercises: brisk walking, jogging, cycling, elliptical machine, aerobics and so on. Each has different training methods and combinations.
Your effect is obvious, but it costs a lot. My principle is: health comes first, and you must never do harm to your body to keep fit. We are fitness, not physical abuse.