You worry at the severity of your illness and that worry increases it. If you want your illness to be less severe, try not to worry. That is, think of the benefits of your illness, the recompense for it, and that it will pass quickly; it will remove the worry and cut the illness at the root.
Indeed, worry increases illness twice over. Worry causes an immaterial illness of the heart beneath the physical illness; the physical illness rests on that and persists. If the worry ceases through submission, contentment, and thinking of the wisdom in the illness, an important part of the illness is extirpated; it becomes lighter and in part disappears. Sometimes a minor physical illness increases tenfold just through anxiety. On the anxiety ceasing, nine tenths of the illness disappears.
Worry increases illness, so is it also like an accusation against Divine wisdom and a criticism of Divine mercy and complaint against the Compassionate Creator. For this reason, contrary to his intentions, the one who does so receives a rebuff and it increases his illness. Yes, just as thanks increases bounty, so also complaint increases illness and tribulations.
Furthermore, worry is itself an illness. The cure for it is to know the wisdom in illness and the purpose of it. Since you have learnt its purpose and benefit, apply that salve to your worry and find relief! Say "Ah!" instead of "Oh!", and "All praise be to God for every situation" instead of sighing and lamenting.
Bediüzzaman Said Nursî / The Flashes / The Twenty-Fifth Flash
Editing: Erhan Akkaya