We know that anything that is haram is both harmful for this world and the next and anything that is halal is not harmaful for this world or the next. So if someone uses magic for healing and not for harming people what are the worldly harms that he may face? Not that I want to use magic or anything in case you get the wrong idea
Quran 2: 102 And they followed [instead] what the devils had recited during the reign of Solomon. It was not Solomon who disbelieved, but the devils disbelieved, teaching people magic and that which was revealed to the two angels at Babylon, Harut and Marut. But the two angels do not teach anyone unless they say, "We are a trial, so do not disbelieve [by practicing magic]." And [yet] they learn from them that by which they cause separation between a man and his wife. But they do not harm anyone through it except by permission of Allah. And the people learn what harms them and does not benefit them. But the Children of Israel certainly knew that whoever purchased the magic would not have in the Hereafter any share. And wretched is that for which they sold themselves, if they only knew.
First of all, you are trying to use something HARAM by knowing it.
Second you believe magic will help you even without the permission of Allah?
If I would be in-place of you, I would love to die with the decease rather than trying something Haram.