That's impossible. A dwarf goes berserk as a form of insanity, when a dwarf goes insane they can't do it again because it always results in death. A strange mood causes insanity when failed.
Nah, dwarves CAN go from "Strange Mood" to "Berserk", although the more common is immediately going to a life ending state rather than going "Miserable" only first.
-----
The only time I've really had an issue with an insane dwarf was:
- Dwarf goes "Strange Mood" status
- Dwarf takes over metalworker's workshop
- Dwarf begins making Serpentine Anvils (I had to dig a long way for that stuff D:)
- Dwarf takes anvils and places them all in the great hall
- Dwarf cracks his/her skull somehow and the body is hidden under hordes of loitering dwarves and animals - I didn't know it was there until:
- Miasma makes dwarves unhappy
- 20+ Dwaves go insane and jump off a bridge taking all the children with them
Later on a goblin raid killed everyone else.