My thumbs and my middle finger nails have become really white around the edges and spreading downward....my middle finger has about 1/3 of the nail fromthe top has turned white...white...I had a nail culture done..the results were negative for yeast and fungus.....there are also black splinter like lines in my nails...so I went to a cardiologist and had an exam....going for an echo cardiogram next week...but dr. is 99.4% sure I do not have a heart problem either?????????????????????????

HELP>>>>>>>>>>HELP....they don't look like any of the pictures on the internet...