Hexagram 51, Zhèn (The Arousing Thunder): Line 3
震卦六三 · 震为雷 · 中文版
六三：震苏苏，震行无眚。
The line (Legge)
The third six, divided, shows its subject distraught amid the startling movements going on. If those movements excite him to (right) action, there will be no mistake.
Small Image commentary
'He is distraught amid the startling movements going on:' - (the third line) is in a position unsuitable to it.
象曰：震苏苏，位不当也。
In plain words
Thunder leaves one dazed; if the shock spurs one to act, there is no disaster. The third line is neither central nor correct, so it is shaken; if it wakes up and corrects itself, it escapes harm. The Small Image says its position is improper.
Applying it to your situation
If something sudden has thrown you into confusion, this line suggests turning the alarm into action. What is the first thing you can do?
Position
A broken (yin) line in the third place, which is a yang (odd) place, so it is not in its proper place. Its partner is line 6; both are yin, so they do not respond.
If this line moves
With this line moving alone, Zhèn changes into Hexagram 55 Fēng (Abundance). The Jiaoshi Yilin verse for this change (Chinese): 焦氏易林·震之丰.
The hexagram
Hexagram 51 Zhèn (The Arousing Thunder). The Judgment: Zhen gives the intimation of ease and development. When (the time of) movement (which it indicates) comes, (the subject of the hexagram) will be found looking out with apprehension, and yet smiling and talking cheerfully. When the movement (like a crash of thunder) terrifies all within a hundred Li, he will be (like the sincere worshipper) who is not (startled into) letting go his ladle and (cup of) sacrificial spirits.
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English text: James Legge, The Yi King (Sacred Books of the East, vol. 16, 1882), public domain, as transcribed by the Chinese Text Project. Chinese: the received text. Offered for study and reflection, not as prediction. Plain-English readings and position notes by this site.