The slide part is transcribed below, it's hard to explain it but after the slide up and you pick it, you slide down into an A chord that you pick around. If you listen to the song you'll get it. I didn't write out the exact number of times you pick out the notes just a guide. 

Have fun, it's a great song to play

   D                                       A
I've had my fun, if I don't get well no more
  D                                       A
I've had my fun, If i don't get well no more
  E                                 D       A                      
My health is failing me, lord i'm going down slow

Momma don't send no doctor, he can't do no good
Momma don't send no doctor, he can't do no good
It's all my fault momma, didn't do the things i should

I want you to write my mother, tell her the shape i'm in
I want you to write my mother, tell her the shape i'm in 
Tell her pray for me, forgive me for my sins

Next train south momma, look for my clothes home
Next train south, look for my clothes home
You don't see my body, all you can do is moan

momma don't worry, this all in my prayers
momma please don't worry, this all in my prayers
Your son is dead, gone off this world somewhere

E-------------------------2
D----//-8-8-8-8-8\\\\----2
G-----//9-9-9-9-9\\\\\\---2
D------------------------2
A-------------------------0
E-------------------------x