I got glasses for my astigmatism?

Well the glasses I got them Friday and it's Monday and I'm still seeing the words double just as I would without glasses I went back Saturday and he told ne it will take a while for my eyes to see perfect and adjust to the glasses but than my brother is scareing me saying it could me neurological like ALS and my legs have been twitching for months now anyways I'm a 18 year old male healthy is my doctor right or is my brother right