I think if you were having a stroke, it wouldn't be taking three days for it to become clear that that is what is happening. Whether it's something that is serious or not, I don't know, and I doubt anyone can tell you over the internet.
When you went to your GP's office and did not get seen, did you make an appointment to go back? Because you need to be examined by a doctor.
I'm sorry for the pain and worry that you are going through. Let us know when you get an answer.