Rav Sadya Gaon: It is as if [a wall] was built around me.

Ibn Ezra: A building around his head.

Ri Kara: An enclosure. Normally, one who goes in darkness, he can feel and walk until he reaches light - the enclosure blocks me.

Palgei Mayim #1: Refer to 3:5:2:8.

Palgei Mayim #2: If afflictions come via [Hashem's] sudden anger, the anger can cool off and He will have mercy. However, if they come with strategies, like one who builds a building, there is no hope. "Banah Alai" teaches that it was not sudden anger, rather, via many causes, like one who builds a building, in order to surround me with them many afflictions and evils.

Rav Sadya Gaon: The height of [a person's] head with the arms extended above.

Rashi: This is like "Rosh v'La'anah" (Devarim 29:17).

Rashi citing Eichah Rabah 3:2: Rosh is Nebuchadnetzar ¹ , who began the exile of Yehoyachin [and ha'Charash veha'Masger]; u'Sla'ah is Nevuzaradan, who finished the affliction in the days of Tzidkiyah, v'Hel'ani (he wearied me).

Ibn Ezra #1: [He surrounded] my head with affliction.

Ibn Ezra #2: U'Sla'ah is [hanging,] like "v'Ami Selu'im" (Hoshe'a 11:7). If so, "Rosh" is feminine, but the [Dagesh in] the Hei is omitted ² , like "u'Sa'arah Lo Hafach Lavan" (Vayikra 13:4).

Ri Kara #1: It is the height of my head v'Halah (and more), so I cannot jump over it.

Ri Kara #2: Rosh is like La'anah va'Rosh (19); u'Sla'ah is fatigue.

Palgei Mayim: Sometimes an illness or breakage cannot heal by itself, but salves can cure it. Hashem surrounded me with so many illness, that it is as if He made a building around me.