Very stressed and depressed

Well today is the first for my journal entry. I have struggled for almost 21 years with anxiety and depression. I have had good times and lots of bad times. I have been on several meds for this and some seem to work for a while then taper off to nothing. I am confused why they cant find a better way to treat this condition. Lots of crying today. I go back to doctor tomorrow and hoping for something better.till later