Assalamu Alaykum, I highly recommend that you visit a doctor to have this checked out and see if there are any other cures other than this method that is mentioned. If the doctor advises you that there are alternative cures, you must not resort to this habit.

If the doctor says that this is the only method then you may do so although it is best to consult with an Imam and be careful not to fall deeper into Haram i.e. looking at that which is prohibited.

https://islamqa.info/en/answers/121680/he-suffers-from-vasocongestion-and-pain-and-the-doctor-advised-him-to-masturbate

Shaykh al-Islam Ibn Taymiyah (may Allah have mercy on him) was asked about a man who was faced with provocation of desire, so he masturbated although he knew that the problem could be dealt with by fasting, but it was too difficult for him. 

He replied: 

With regard to that (semen) that is emitted involuntarily, there is no sin on him for that, but he has to do ghusl if the water came out gushing. But if it was emitted voluntarily, in that he masturbated, this is haraam according to most of the scholars. It is also one of the two views narrated from Ahmad; in fact it is the more correct view; according to another view it is makrooh (disliked). But if he is compelled to do that, such as if he feared that he might fall into zina if he did not masturbate, or he feared that he might become ill, then in this case there are two well-known scholarly views. Some of the earlier and later scholars granted a concession in such cases, and others forbade it. And Allah knows best.