All perfect praise be to Allah the Lord of the Worlds. May His peace and blessings be upon our Prophet Mohammad and upon all his family and companions.
At the beginning, we pray that Allah the Almighty blesses you with a speedy recovery. Indeed, He hears the supplication of those who invoke Him. We advise you to exercise patience and be content with Allah`s Reward since worldly life is the abode of trial and the Hereafter is better and lasting.
As for your question about the Diya (In Islamic Law, Diya is the financial compensation paid to the victim or heirs of a victim in the case of murder, bodily harm or property damage), it is lawful for you to take it because the one who hanged that billboard caused that felony leading to disabling parts of your body. Jurists are agreed that it is obligatory to pay full Diya if the committed felony led to disabling the victim`s legs only and its amount increases in case other functions of the body were disabled and wounds sustained. In other words, the amount of Diya depends on the degree of the harm inflicted upon the victim." {Al-Mawsou`a al-Fiqhiyah, vol.16/pp.85}.
According to the Iftaa` Board`s Resolution issued in (1430H), the full Diya is estimated at twenty thousand JDs, so a woman`s Diya is ten thousand JDs since hers is half of a man`s, as agreed by jurists. And Allah The Almighty Knows Best.