Silent migraines medications

I have been getting more silent migraines (visual disturbance without headache or other symptoms). I have a GP appointment next week and I'm researching possible treatments to stop these occurring.

. However I have had heart surgery in the past​ and I'm on a beta blocker so am restricted on what medications I can take.

Can anyone tell me if they have used low dose aspirin and has it helped? I've also been looking at magnesium (although I am not sure I can take this) and riboflavin supplements (vitamin b12)

Many thanks everyone