***TOE NAILS GETTING THICK, then Black lines spots in nails

***TOE NAILS GETTING THICK, then Black lines spots in nails it started a few years ago, one toe nail started to be thicker then after a while inside that thickness two black spots or black lines, then over years the same problem started with different toes. Gp tested a couple of times and its not fungus. Does anyone know what it it and how to get rid of it before it attacks all toe nails? No antibiotic helps. Please check my pic thanks

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If no antibiotic helps and its not fungal , has your doctor considered nail psoriasis?Its worth a mention. Sorry I dont have any recommendations for treatment but your doctor can soon do his/her own research on the web and also ask colleagues. I believe there are laser treatments available but they are expensive .