I have had similar symptoms for over 7 yrs. Such as fatigue, brain fog, lack of sensation on the left side of my face, numb thumbness, constipation, pins and needles in my hands and feet, pain in my legs, clumsiness, hot sensation in my inner thighs and left heel, and being constantly tongue tied. Several MRI's and many Dr's later, not a clue to the cause. To make a long story short, 6 mos ago I started to have major heart palpitations. A blood test revealed I was B12 dfficient. 2 weeks after I started the B12 injections almost all of the symptoms went away literally over night. I never thought I would feel normal again. Have you been tested for B12 deficiencies? It's said the symptoms can mimic MS and Parkinson's! I have 5 young children so I know where you are coming from and I'm only 33 yrs old. Hang in there!!