Tomatoes, yay!
I'll betcha you planted a determinate variety. They grow to a certain height, produce a single crop, and die. This is normal.
If you know it was an indeterminate variety, that just keeps growing as long as you want to keep staking it, you may have one of the many viruses that tomatoes are prone to.

Did you know there is a vegetable forum on this site? They like their hot peppers over there.

Stay away from meth. Too artificial and scary.