Obsessive Worrying

I worry obsessively and I don't know how to stop. 

I've always been a big worrier. As a child I used to worry all the time, it affected my childhood greatly, my school work suffered because of it but with my mum I was happy and I played with my toys and that stopped me worrying.

Now I'm an adult my worrying is obsessive and ruining my life. I found out the other day my mum has macular degeneration and she's losing sight rapidly in both eyes.

This scares me so much I can't begin to explain how terrified I am for my mum and I'm worrying about her going blind now. It's affecting my sleep and I'm getting physical pains from all the anxiety.

I'm not sure what to do about this. It's a horrible situation. 

My mum will go blind and that's a horrible thought. A part of me wants to go blind too how so she isn't in this alone and another part blames me for this because I've caused her so much stress all these years.