I'm sick and tired of school, I want to dropout. I wanted to get a degree in Pharmacy after high school but the death of my mom and all the aftermath stress is too discouraging. Am I making the right decision?

It sounds as though the emotional stress of losing your mother is really bothering you.  I would try to get some counseling to help you through the loss of your mom.  Perhaps, with some help, you can work through losing your mom and work on making your dreams come true.

Not having a high school diploma makes life much harder.  Jobs available to those without a high school diploma are low paying and have dead ends.  You cannot go to college without, at least, a GED or HSED.  Many colleges and universities prefer high school diplomas.

However, it is your life.  Just make sure that you think of what you want in life before you make a big decision like this one.