Seyed Ali Shobayri,
Seyed Ali Shobayri is of mixed Iranian and Scottish descent who found the path of the Ahlul Bayt (a) by his own research. He holds a BA in Islamic Studies from Middlesex University through the Islamic College of London. He also studied at the Hawza Ilmiyya of England and continues Hawza and Islamic studies with private teachers.
One should see a specialist and doctor (preferably Muslim) to determine whether fasting could be truly harmful for them after recovering. If it was ruled to be harmful and you yourself know it that can harm you, then it’s possible for you to be exempted until your state improves.
May Allah give you success