I feel my life is pointless
Is there something that happened that makes you feel that way?
It started a long time ago, when I got sick.
It sounds like you may be depressed. You should talk to someone if that's the case. You'll end up feeling better about your life.
My doctor prescribed pills for me but I feel like it'll never work.
Sometimes medication can take a long time to work. You should communicate with your doctor about your feelings so they can adjust your medication or try a different therapy.