"Please check the anchor text. they are different.
Non of anchor test is more then 15%. So, Atleast, this is not the reason for Penguin penaly. ( some thing else can be the reason)"
-> and so what? Read more about Penguin and how it works.
" 4. "In case of Link Building Campaigns what can I say. First you need to remove all the low quality backlinks then think about LinkBuilding, because maybe now you are gaining high quality links but all the bad links, you earned earlier are the problem."
sorry, but not agree with u on it.
5. "Maybe think about running a blog about health where you will produce high quality content about health, diets and stuff like that. I mean high quality content not product advertisement."
Again, not agree with u.
this was ranking No1 and 2 for these kw's
its ranking well in yahoo + bing."
-> Yeah, you're right your site WAS ranking well, but no more.
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If you do not agree with me on these fundamental points, unfortunately I don't know how to help you.
Thanks,
Jakub.