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The description you give is a generalized not feeling well impression. The eye goop is most likely from a dehydrated state in the dog, the shivering can be from pain and definately the tail is showing you discomfort. At 14 years of age, you need to take this dog in. There is something more serious going on, and you need it diagnosed so you can help her out...2 weeks is too long for this to be happening, please seek out a vet soon.