AM I THE A$$HOLE ?

I’ve been dealing with a lot of medical issues , mainly being extreme joint pain . I’ve been trying to stay off the internet so I don’t do my own research , even though I don’t see a problem with wanting an idea on why I’m suffering , but my mother definitely hasn’t . 

She’s consistently come up with new ideas . Growth spurts , protein deficiencies , hypochondria … the list goes on . A lot of the time I just say “ or it could be something else , like chronic pain “ and the only response I get is “ stop assuming the worst ! “ 

I like to confide in my boyfriend about my struggles , but he tends to compare my issues to his . The problem is his problems are different , he hasn’t gone to a doctor in a decade , but when I say I’m scared of what’s going on with me he says he feels the same way and he’s fine . Today I finally told him it feels like he’s downplaying my problems , and he said he thinks I’m over exaggerating aka my biggest fear . 

I told him all I want is comfort , and he just stopped the conversation , am I wrong for wanting to know what’s wrong with me ? I have appointments coming up , I just wanted some sort of understanding . :/