Hi there,
tell your mom, I know that it seems like a huge burden for her but it is not, she will be so glad that you came to her with this and she will be able to help you get through all of this.
Maybe ask her to go for a walk, then you can be outside and perhaps that would be less threatening to you. The truth is these things will not just go away and parents are a great place to go for help and support.
Like you said she probably has a lot of stress already but chances are that she is already worried about you so showing her that you want her help will make her feel good.
It might be tough but in the end it will really help.
Keep us posted and best of luck.
J