I don't think 2 weeks is here or there really. I think when things are awry for 3 consectuive months is when you need to follow it up. Although my GP gave me a blood test when it all got very heavy. Then the consultatn said it was worthless as it had been taken too early in the morning and I was probably stressed and in a rush (yes!) so he took no notice of whatever hormone it measured!
As well as allergies, have you thought about your accident and the trauma it caused your body?
I went to roll on icing some years ago. I always used to do everything properly with Royal icing in layers over several days and look down my nose a bit at the ready made stuff. But ... I'm not very good at icing, it's 10 times easier, several days quicker plus it looks better!!