Could My Brief Visual Disturbance Be Related To My Migraines Or Slow Heartbeat, And Should I Be Concerned?

Hi, I suffer from migraines with aura , it doesn t give me a headache and usually lasts for 5 mins at the most. I use the pc a lot , then 2 nights ago my sight went perculiar, each eye wasn t looking at the same thing, this lasted for about 20 seconds. then back to normal and I havent had a return of the condition. I do have a slow heart beat 42 normal resting dropping to 37 sometimes, this has been normal for me for a long while , I was super fit as a youngster and played many sports to high level. this slow heart beat is also happening in my children, not as low as mine. I have had my BP checked by the doctor and it s fine, I do take Amlodine 10Mg daily and I am 80 years old and walk 20 miles a week