Hello,
Two possibilities need to be ruled out from these symptoms. The first possibility is of fungal nail infection and the second is of psoriasis nails. In onychomycosis(nail fungal infection) nail plate can have a thickened, yellow, or cloudy appearance. The nails can become rough and crumbly, or can separate from the nail bed. Topical and oral antifungals are needed which are available under prescription. My sincere advice would be to consult a dermatologist and get a KOH examination of the nail and skin specimen done to confirm the diagnosis. Also nail fungal infection may take a bit longer to go away. So it is important to use the topical and oral anrifungals as and when prescribed by a dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
sorry wrong link
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http://i1133.photobucket.com/albums/m593/chinesebrush/DSCI0016.jpg