I think that I have ALS (Lou Gherigs Disease) and Im only 17.... Please help I'm so scared!?

I'm only 17 and I think that I have ALS........ Im a male who had open heart surgery at 11 to repair a diseased aortic valve and Im currently only on Metoprolol Tartrate 50Mg and a Baby Aspirin..... I just had a check up with my cardiologist yesterday and he said he was pleased with how everything turned out and I wouldn't need surgery until im in my late 50's at worst..... Here is why I think I have ALS..... When I'm reading something I constantly miss read it , often inserting words into a sentence that are not there.... Like When I read something in my head or out loud I will say a word that is not in the sentence.... for ex. I see blue skies..... When I read stuff I often go I see the blue skies... I catch myself doing that so much.... Or when people are talking or Im listing to the T.v or radio....They will say something and I will hear something similar.... for ex... The fish is on the hook..... I hear The fish is on the book??? Happens a lot through out the day.....And then I constantly feel like I am in a dream........ Nothing seems real...... Im depressed all the time...... And I get random pains but my mom calls them "Growing Pains" And my fingers are constantly aching........ And my memory is a little off...... and I get random pains in my legs that come and go..... Saw a psychologist a year ago before all these symptoms and he said that i suffer from anxiety...... Any opinions???? Im scared to death!!!!!!