Is fatigue the main treadmill issue or is it faster heart rate the issue?
Can you do moderate weight lifts, slowly , added to the treadmill work?
Not heavy or to bulk up, but more reps with a moderate comfortable weight.

Basics- read labels, avoid junk food /drinks, focus on veggies and lean protein cooked healthy - baked, broiled , steamed , crockpot , etc not fried.
Coconut oil is new thing now, olive oil is good.

If you can figure out your triggers to eat or make bad food choices... easier said than done tho...

We do have a weight loss forum here too, with posts, info & various diet plans linked in the sticky threads.
http://neurotalk.psychcentral.com/forum42.html