Tell your mom you need to see a doctor that something isn't right maybe she'll listen then
If your mom wont listen to you, reach out to somebody else who will! My dad is the same way, doesnt believe in mental illness and taking medications, he thinks its just another way for drug companies to make more money.
Your mom doesnt understand, or maybe she is just in denial that you might habe something like this going on. It can be hard on parents watching there child struggle. Maybe she thinks telling you things like your just being lazy and selfis will make you snap out of it.
If you cant go to a psychiatrist yourself, then try to find another family member that might believe you and help you out.
Good luck!!!
Can you go and see a doctor because they will help you and there are excellent medications avaliable aswell.You need to go very soon and don't do anything silly because it's never the answer,you will get better.