Several autoimmune diseases , mucus discharge

Hi, welcome to the ehealth forum and I am glad to help you.
You seem concerned with excess mucus production. You have made a mention of having the diagnosis of Sjogren's, Hashimoto and Fibromyalgia etc.
Excessive production of mucus in the nose in the form of a chronic problem is symptomatic of some condition and is not considered a disease in itself. Though the excess production of mucus is usually connected to the nose and the chest-excess mucus production as a chronic condition can arise anywhere in the internal lining of the body covered by mucus. The presence of a persistent runny nose, excessive sneezing, a sensation of stuffiness and a nasal tone to the voice signals the excess production of mucus in the sinuses. A chronic infection which is taking place is often inferred from a persistent postnasal drip. Sputum can also be brought up in large amounts by a chest filled with mucus; this accumulated matter will cause a lot of rattling and coughing over a long period of time. Wheezing may also often accompany an excess of mucus and it also makes breathing normally very difficult and causes a great deal of discomfort.
The presence of a chronic irritation or inflammation arising as a result of some allergies, related problems like hay fever and asthma is the usual cause of most chronic problems with excess mucus production. Recurring or continuous mucus production in excessive amounts can also be caused by other conditions such as chronic bronchitis or the presence of a sinus infection, in addition some heredity causes can also bring about such a condition, as can excessive smoking, and the presence of some nutrient deficiencies, the accumulation of toxic heavy metals within the body can also bring about this condition.
You must consult your personal physician for definitive diagnosis as the same is not possible online.
Hope this helps. Take care.