Welcome to the forum Bessie
I am sorry to hear of all your problems. As you may know, lupus and lupus related disorders can present with a wide variety of symptoms some less common than others. Movement disorders ( dystonia) of various sorts and hemiparesis can be associated with lupus. There are a few people here who do suffer from these symptoms and I am sure they will be along soon to give you their stories.
I am sure too that there are numerous differential diagnoses for such symptoms.
The whole topic is quite complicated. It has to do with what is called Neuro-Pyschiatric lupus (NPLE) formerly known as CNS ( Central Nervous System) lupus. Such symptoms might also be related to a blood clotting condition called antiphospholipid syndrome, APS, which can accompany lupus or be an independent primary condition.
It is certainly worth exploring the lupus /APS possibility. There is no single blood test for lupus. The one GPs usually do is called the ANA test which is very often found in lupus but is not in any way specific for lupus and isn't always found. It isn't relevant in diagnosing APS. Find out what test he did and keep a record of all tests and their results
I suggest you read the articles about symptoms signs tests and diagnosis on the information section of this site as well as the criteria lists pinned at the top of Not Yet Diagnosed sections here. You might see other symptoms that you have also experienced. The hair loss, Raynauds, headaches and thinking problems could well be associated.
You probably need to see an experienced lupus specialist rheumatologist who might well refer to a Neurologist for more specialised tests and investigations.
Bye for now

Clare