'Marge Gamer' (17th episode, 18th season).
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Bart has to see a pychiatrist in the episode Yokel Chords- after telling a scary ghost story in the school cafeteria to get free food
'Marge's Son Poisoning' (episode 5, season 17).
'New Kids on the Blecch'.
The name of the episode is Barting Over. It aired on February 16 2003 and is the 300th episode of the show.
Yes it is ~ sources is watching every simpsons episode out there