Hi Carolyn, welcome to Healing Well. I am glad you are going to see a Neuro, and hopefully he/she will be able to give you some better info.
I have had migraines for a long time too, and I smell things that are not there - it is usually smoke or cigarette smoke but there is nothing there!!! - but I have never known why that is, maybe cos I have not asked!! lol - but my phantoms smells are at different times to the headaches and as far as I can tell are unrelated.
Sorry I cannot be of more use to you, but I will be asking now you have brought this up!!!! - please post and let us know how you get on.
take care Ann.