I have some of the exact same symptoms as you and I am in the process of trying to get it diagnosed. Specifically my symptoms are:..brain fog, procrastination, confusion, speech not as flowing. Muscle weakness and ligament weakness, night sweats and tempreture sensitivities, I sweat easily, fatigue due to muscle weakness I think. Whites of eyes can be red and pain behind eyeball feeling bulgy slightly and eyelids hesitating to close in morning, when I get up. periods of head Hair loss and body hair is minimal   Astgmatism that varies but definately started when that the rest started. Sciatica, can be chronic, and element of dehydration. Loose bowels, 2 movemments a day where the second is very loose and recently a bladder infection for 7 weeks due to yeast....I have mild IBS..it seems to be from Milk, however, I am on lactofree milk and it still flared up recently   I found that drinking water, 8 glases a day, (no juices, only pure lemon for a change) lifted the muscle weakness, lower back tenseness and Sciatica...I was free of these for just over 2 months and was elated!!  but then this happenend...   I noticed I am nervous, I jump at noises which isnt like me, I feel anxious when there isnt anything to be anxious about, I can pace around and waste energy.. I have had minor palpitations and the marked thing was during thE palpitations I felt something go rushing around my body, it produced nerve sensitivities in ring and little finger of left arm... which led to a feeling of stiffness in fingers whilst my muscles all started to feel weak again . The following morning I was stiff again, and Bursiitus occured, the dry eyes and eyelid problem was there...stiffness that was burning in back of lower neck and shoulders, where the tip of one was very painful..(where the tip of the shoulder meets the arm joint.) and nerve pain?..in right shoulder...feels like it is sore and as if something is rubbing it sore when there isnt anything there...   I have had all of the symptoms for 8 years, this last attack was the most dissapointing as I thought It had gone, (wishful thinking) and the bursitus was the worse it has ever been...it has remained  undiagnosed so I am going bck tomaorrow again to the Docors......   I am questioning whether it is any of the following: Hyperactive thyroid, IBS, perhaps some sort of Rheumatic condition, or gout, or Diabetes 2 or some sort of Sugar related problem, allergies which I will ask the Doc to test for and lastly, a yeast bacteria....   I remember I had a sugar addiction awithin this timespan....