First off you're going to gain muscle from running that long on a daily basis, muscle weighs more than fat, so that'll make it extremely difficult to 'lose weight' since muscles weigh more than fat by a long shot.. You shouldn't focus on weight when you're trying to get fit, focus on how you look and feel, that's what's important, not a number over a dial.
Avoid the coffee if you want to lose weight, lower your caffeine intake, I'd suggest swapping your morning coffee for black/English tea with little to no sugar and some cinnamon.. Cinnamon has been shown to greatly increase how effectively and quickly your body processes sugar, and is known as a metabolism booster as such.
Low-fat foods and diet drinks/foods are all scams, they don't help you lose weight... They all replace the sugar or fat with things that are ten times worse for your metabolism, things like aspartame or hydrofoxocodonetoolongtopronounce.
You can't just up and become thin in a month if you're obese, it takes pre-existing willpower to get fit like that.. People who get like that don't -have- the initiative to do it in the first place, that's why they get like that.. If I were you I'd start self-treating for hypothyroidism right away, it's a silent pandemic in areas like America/Britain/Australia, it doesn't get diagnosed 99 times out of 100 cases.
http://healthmad.com/nutrition/iodine/
The above link is to an article I've written that'll describe how to fix hypothyroidism and get your thyroid up and running, it should take about 6-8 months of proper supplementation but after that point your metabolism will kick in and you'll find you have more energy/initiative/more body heat.
It'd do you well to read it.