I am not sure type of cancer or when you had chemo, but I remember having stroke risk discussion with my oncologist about taking AIs.
Here is article on breast cancer treatments that have been associated with increased stroke risk: https://www.breastcancer.org/treatment/side_effects/stroke
I would definitely contact your oncologist on Monday about what happen and ask him/her about cancer treatment and increase stroke risk.
What advice, treatment, or preventive measures did the drs. in hospital recommend?