How would you feel if I told you I accidentally took my mom's med-x last night and I'm too scared to tell anyone?
Why would you take your mom's medicine? Don't be scared and just tell her.
I don't know why I'm scared to tell anyone, I'm probably in trouble if they found out
If you've done something that could be harmful to your body, you should talk to someone as soon as possible so that steps can be taken to prevent further damage. Let your mom know that you took her medicine and call a doctor to get this situation resolved.
There's no point talking to anyone mainly because I don't want anyone to know it was me who took it.
Are you afraid people will judge you? If so, trust me, your mom would actually want to help you and not at scold you. You will find opening up to others to be a very meditative and peaceful experience, and that will also make the family bond stronger.