are you getting enough sleep? worrying bout all of your vitimin intake etc will tire your mind. Try to get your vitimins thru your diet , in your food , have pleanty of greens.
Also slim fast doesnt always agree with every one i was a keen slim fast customer..........but its a very bulky nutritional drink. It causes constipation in which is why i had to stop using it. And constipation in iteslf has symptoms such as being tired and lethergic. Try cutting out your suppliments and u will come to realise you really dont need them you get just as much benifit out of the foods you eat , good luck x

If you were tired before, it may be an iron issue. Funny that the most developed countries in the world have an epidemic of anaemia. Most women in first world countries are anaemic simply because of our cycles once a month.

I'm PCOS too. I was lucky enough to be referred to a superb ob/gyn (though he did mess up the Metformin since my stupid doctor didn't forward my bloodwork to him) who gave me bits and pieces of advice for weight loss.

Basically, he said take out ALL the refined sugar in your diet (nearly all processed foods and drinks have them) then start out on a low GI diet and eat 6 times a day. Low GI diets have less sugar, but you're eating more often and that will keep your blood sugar stable. When your sugar crashes, so do you. It's an insulin resistance diet combined with counting calories.

I'll also agree with Lucky8: get your vitamins and minerals through your diet; only 5-10% of the capsule you take is absorbed into your body, the rest is treated as waste.