All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
If the situation is as you mentioned, we hope that there is no harm on you for breaking the fast due to your sickness. You do not have to expiate for it and you are only obliged to make up for the day you broke the fast.
For more benefit, please refer to Fataawa 85374, 88916 and 89094.
Allaah Knows best.