Be confident that Allah knows what is best for you: You should place your trust in Allah and must remember that you do not know the wisdom behind this trial, perhaps it will make you stronger and lead you on a path to a better life. We should never limit Allah’s wisdom to our comprehension level, because we will never be able to comprehend it — it is above our capability to understand. We should, however, know for a certainty that Allah does not intend harm because it is harmful. Harm with Allah is not intended for itself but for other things that may bring good.
Ibn Uthaymeen, may Allah have mercy upon him, said: “Allah doesn’t particularly intend harm for a person when He causes him to become ill. Allah intends for the disease to take place and the disease is what may harm man. But He did not intend harm for man. He intends for him only the good from it. Sometimes, the Divine Wisdom may be apparent to the sick, and sometimes it may not. As Allah has said (what means): “And fear a trial which will not strike those who have wronged among you exclusively, and know that Allah is severe in penalty.” [Quran 8:25]
Remember Allah and ask Him for forgiveness much: Ali said: “When Allah guides His servants to ask for forgiveness, He helps them to achieve what they request.” Allah has said (what means): “But Allah would not punish them while you are amongst them. And Allah would not punish them while they seek forgiveness.” [Quran 8:33]
Allah has told us that He would not punish someone who seeks forgiveness, because sincere forgiveness removes the sin that is the reason for the punishment. The Prophet said: “He who is constant in seeking forgiveness, Allah will make for him a way out of any distress, release from grief, and provide for him from where he does not expect it.” [Abu Dawood and Ibn Majah] So whoever believes in Allah alone and seeks forgiveness from Him, He will provide for him an appointed term, and whoever does good after that, He will increase him from His Grace.
Supplicate with a humble heart and a crying eye asking Allah to cure you: Try to take advantage of the time when supplications are more likely to be answered, praising Allah and calling upon Him with His Beautiful Names. It is also recommended to give something in charity from the best of your possessions before making your supplications. Understand and realize that illness is not the end of your life. If Allah has taken something from you, think of all the things that He has given you and all of the things that you still have.
A believer always strives for the pleasure of his Lord and does not stop because of disease or a trial. The best example is the example the scholar of this nation; Ibn 'Abbas when he lost his vision and said: “If Allah has taken from my eyes their light, it is in my tongue and heart that I will find the light. My heart is bright and my mind has no defects. And in my mouth there is a sharp, authentic sword.”
Guard the obligatory acts of worship:
Do not neglect them to the best of your ability. If you have any questions, ask people of knowledge. Perform many good and righteous deeds as possible. If someone else can do them for you on your behalf, this is also acceptable. Beware of any practice that is not lawful, especially those against our faith, such as slaughtering animals to anything other than Allah, hanging charms, seeking refuge with jinn or going to sorcerers.
When you are physically able, try to occupy your time with beneficial things like reading. Find activities that you enjoy and that will distract you from your disease and worries.
Always remember that your faith can and does make miracles:
Do not underestimate the effect of reliance upon Allah. There are many incidents that have been witnessed where the impossible becomes possible by the power of faith.
Although the cure for illness is out of our hands and is up to Allah alone, we can still do something to make a difference to those who are suffering. It is unfortunate that often times we belittle the impact we can have on others, especially to those who are ill. Just a smile or a funny story to make someone laugh and forget their worries for a moment is something that can be remembered for years — because it made an impact and it made a difference. How many times have we experienced the impact ourselves in our own lives when someone visited us or gave us a call - just at the time when we were at our lowest moment? Most of us will never forget that person who took the time to think about us, and we always remember them fondly because they — without realizing it —helped to shine some light on our dark days.