Is it normal i lose 28lbs in 6 weeks?

2lb a week is about the maximum you can safely lose in a week. Sooo...no.

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You surely know that is not healthy. You can only loose weight that fast if you are young and dieting. If you eat organic and exercise, and cut out the sweets, you should not have to try to loose weight, it will happen naturally. Let your body be at its natural weight. My guess is 109 is too small. You might have a parasite too.

We're you sick or something?

if you're worried about it go and see a doctor

You do realise your metabolism now believes there's a famine and will hold on to every single ounce you eat from now on?

That is not healthy and you must know that: you're setting yourself up for the lifetime of yo-yo dieting and possible eating disorders

Doesn't sound very healthy, but if you can keep the weight from coming back without creating an eating disorder, you'll be OK.