الجواب وباللہ التوفیق

Since doctors have mentioned that hormonal disorder is apparently the cause of this problem, therefore it is recommended to continue the prescribed medical treatment.

As for the suspicion on evil eye or witchcraft, if found necessary, consult a qualified religious scholar of this field for treatment.

In reality, it is in the hands of Allah (SWT) to bestow upon or hold back offspring to whomsoever HE Wills.  

Therefore, sometimes even without an apparent reason, a married couple is unable to procreate because Allah did not Will so, because of HIS ultimate wisdom and hidden advantage behind it for that person.

In light of the above, keep praying to Allah (SWT) and submit yourself to the Divine Destiny, which is the right way of a believer.

 لِلَّهِ مُلْكُ السَّمَاوَاتِ وَالْأَرْضِ يَخْلُقُ مَا يَشَاءُ يَهَبُ لِمَنْ يَشَاءُ إِنَاثًا وَيَهَبُ لِمَنْ يَشَاءُ الذُّكُورَ۔ أَوْ يُزَوِّجُهُمْ ذُكْرَانًا وَإِنَاثًا وَيَجْعَلُ مَنْ يَشَاءُ عَقِيمًا إِنَّهُ عَلِيمٌ قَدِيرٌ (الشوریٰ: ۴۹ تا ۵۰)

فقط واللہ اعلم بالصواب