Weightloss Gurus.

[eb_5litre]

Hi all, are there any health/weightloss/fitness gurus here?

Heres the deal, At the beginning of the year I promised myself I would lose atleast 40kg... i'm currently about 50kg over ideal weight.

Well 4 weeks ago I drastically changed my diet..... no flavoured milk or soft drink etc, no pasta, limited rice, limited potato, switched to multigrain bread, no butter/margarine, healthy cereal for breakfast, no eating after 8pm etc etc.
I started walking 4km every second night and I drink between 2 & 4 litres of water per day (ya get used to it).

To date I have lost 9kg, 4cm off the chest, 6cm off the stomach and 4cm off the waist.

The problem is that the last couple of times I went walking I've been struggling a bit, not puffing or short of air or anything, but getting weak in the legs and slightly blurry vision.
I never go hungry and always have 3 meals a day and obviously plenty of water. I also take multi vitamins.

Should I be concerned or would this be considered normal for what i'm doing with diet etc ??

Details: I'm 30yrs old, extremely unfit re: lazy, and have a genetic condition rendering me unable to sweat...... I have sweat glands in my hands and feet but thats it... everywhere else completely dry no matter what the conditions. Which is why I go walking at night. (called Ectodermal Displaysia if interested)

If the walking is causing me harm is there something else I can be doing which is more suitable?