letter to my mentor

How did you deal with 4th year? I remember you saying that 4th year can be fun - people let you do more, you can try stuff out, you know enough not to be a complete idiot, etc.. I agree with all of that. I have definately enjoyed parts of fourth year, but then at other times I just can't wait for it all to be over. I keep thinking that if I have to see one more time how someone does it "their way", I am just not going to try anymore. I am just going to curl up in the corner and suck my thumb.
I get frustrated when not everything goes well. I feel like I am far enough in that stuff should go well. I feel like if it doesn't go well people just think "stupid resident", and that makes it OK for them to yell at you and treat you like crap.
Then the drowning feeling (which will only get worse, I know). The overwhelming feeling that things are fast spinning out of your control. Questions, orals, research, talk rounds, Journal club, cases, application to the Royal College. It seems like there is never enough time. And 5th year is getting closer and closer and closer and the train is going faster and faster and faster. Gotta get it done, gotta get it done, gotta get it done. Can't you just hear the wheels churning?
Can I do this? I don't know. I think so. Am I good at this? Sometimes I definately think do. Can I pass? I am just not sure? What will I do if I don't? Again, the picture of curling in the corner and sucking my thumb comes to mind....

So, the question is: Did you feel like this? How did you cope? What advice do you have? Do I need medication, or is this all normal?