I have had blood drawn, but only for an allergy test (my skin is too sensitive for the prick test). The ENT first suspected infection, but the antibiotics had no effect. We then moved on to GERD, but omeprazole has had no effect. The allergy test indicated allergy to many airborne sources, but it doesn't seem to be the direct cause of this problem. I am about to start using an Breo device to see if that has any effect. I recently started using Vaporub all over my chest and neck area, and that seems to provide some relief. On another note, I do have a deviated septum may be a part of the cause. However, the ENT says the deviated septum should not be causing all this trouble.