Nail discoloration, ridges, pitting

been to a dermatologist last month who had no clue.

mostly affects my big toe and index finger nail.

no its not fungus

 

Your nails look clubbed. This link might be of interest

https://patient.info/doctor/clubbing

Onychorrhexis possibly??   Do you have any other chronic health condition?    Try rubbing some warmed Olive Oil into the nails .