Welcome to HCM
We understand your concerns
I went through your problem description. I sincerely advice you not to worry too much about this.
You should be able to keep a log about the black outs now on. When it is coming, what is frequency, length, your state of mind during the black out, weather outside etc. Include whatever details you can have.
Then visit a physician. he will help you. But I am sure that this is just an illusion out of over stress
Hope this answers your query. Available for further clarifications.