How can the obsessive fear of death, illnesses, and the death of relatives be overcome, especially after personal experiences and the increase of this obsession after childbirth, with a desire for non-medicinal solutions?

The cure for what you are suffering from lies in being content with Allah’s decree and submitting to His judgment, while remembering His gentleness, having a good opinion of Him, and contemplating His beautiful attributes. By doing so, the heart will be at peace, and you will realize that death is better for the believer because they move to an everlasting bliss. Your fear of death will then transform into a positive motivation to prepare for it. This does not contradict consulting doctors.