I'm not real clear about your diagnosis..you HAVE been diagnosed with lupus? (Just because your mother had it doesn't necessarily mean that you have it!)
The mitral valve prolapse and bronchitis aren't related to someone having MS.
Your other symptoms do sound like what a lot of us with MS experience. But the only way you'll find out is if you go to a neurologist and get tested, as there are a lot of diseases and disorders, some of them quite treatable, that can cause many of the symptoms you're describing.
I wouldn't walk in, though, and declare "I think I have MS." Rather you'd want to tell him about your lupus diagnosis, your family history of autoimmune diseases (mother with lupus, aunt with RA), tell him your medical history (the mitral valve prolapse)
and then tell him your symptoms. Before you go in, you'll want to list the symptoms and try to remember when they first started, if they worsen (like you described in front of the pizza ovens, for example), if there are periods of the year when they're worse (some people seem to have flares in the spring; others in the fall, for example).
Sounds like you've seen a lot of different doctors. I think it's really important that you find one doctor (this can be your regular family doctor; doesn't have to be a specialist) who can follow you over time -- someone you trust, who you can call and at least report new symptoms, if there isn't a need to actually go in to the doctor. Since you've seen a lot of different ones, it will be important for you to gather up all your medical records from the various doctors, put them in some sort of chronological order, and then take them with you to the neurologist.
Don't expect the neuro to necessarily be "friendly", or willing to hold your hand or "have a good bedside manner", though! Many specialists, and neuros are sometimes notorious about this, don't really want to be personable with patients. They see their job as to examine the patient, diagnose the condition(s), and refer the patient back to their primary care physician for follow-up and continuing treatment. So if he's brusque, or impatient...try to separate his manner from his expertise, and if he seems to be working hard to diagnose your situation, he might be worth keeping until the diagnosis is reached -- and then you'd want to find a family physician, who IS trained in personable patient care! -- to follow-up treatment with you.
...I am not a doctor, nor health professional, and don't pretend to be one, here.....