I don't think that has anything to do with Discoid Lupus. That isn't a common symptom with Systemic Lupus either.
I would talk to my Dr, probably starting with my Primary Care Physician. Could be anything from sinus to migraine to something more serious - they can do the beginning diagnosis and point you in the right direction.
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2002DIAGNOSING LUPUS & HW's LUPUS 101
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