My symptons went on and off between about weeks 7 and 9. Then they came back with a vengance around week 10 and haven't left me since.

I also had brown coloured discharge and one bright red bleed. I was panic striken at the time but all is fine now. I still have moments were I am a panic monster but they are getting fewer and fewer. I think I calmed down a lot after the magic 12 week mark.

I don't know that what I have said has been any help but I don't think you are neurotic... I think you are a first time mum going through a first time pregnancy and experiencing the unknown which is often the hardest thing to do... I am doing the same at the moment!