Alcohol use (or withdrawal)
can cause seizures. And even though marijuana may not typically
cause seizures, everyone is different. We are all wired differently and even though one person may be fine when using something, another person can have a totally different experience. People can wind up having seizures, heart attacks, strokes, etc.
I'm not sure what your history is, but however you got to where you are now, you need to make changes and put it all away.