I am looking for the name of the sefer that discusses the types of punishments given in Gehenom?
It's an old sefer and I can't remember the name.
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Collating answers from the comments in addition to my own:
Regarding this last suggestion @N.T. wishes to point out that R. Yosef Karo maintained that this work ought not be read (see SA:OH 307:12), however others such as the Ramhal praise it and its author and it is similarly cited by R. Yehudah Aryeh mi-Modena, R. Eliyahu Behor, and the Yashar mi-Kandia (for discussion see here). It is also worth pointing out that the liturgical poem Yigdal is likely an adaptation from this work (fourth chapter). As a question of personal practice, consult a competent halakhic authority.
You may be referring to Minchat Yehuda, by the great mekubal Yehuda Pitaya, which describes everything that happens to a Jewish soul after 120 years. It has also been published in English translation.