Unfortunately, therapy has a negative stigma because the extreme end of human craziness is given much media attention. Therapy is just the act of venting stress to someone who is qualified to listen, will keep what you shared confidential (they can't share to family without a patient's permission unless it is a matter of life and death or law enforcement has a warrant) and can possibly help with a number of potential solutions. A therapist is a doctor to ensure a healthy mind as a physician is a doctor to ensure a healthy body. There are apps like talkspace that let you talk to a certified therapist online which you may want to look into.
Do you feel you can talk to your mother openly about your anxieities? Perhaps if you share the way she makes you feel the way you did with us, she may be open to at least letting you attend therapy and this would also help you take an important first step to deal with your fear. If you are worried, have a relative you can trust to mediate so it doesn't devolve into anything physical or help you trigger your fear.
Wishing you the best Yanyi