fatigue, nausea and dizziness with fainting

I am a 35 y/o female dx w/ Hashimoto's disease, yet I have only had two thyroid function tests come back abnormal. One was high and I was placed on .50 mcg of synthroid. I had another test 3 mos later and my TSH was .05 so I was taken off of the synthroid and referred to an endocrinologist. During my initial visit with him he found a significantly large nodule on the right side of my thyroid and referred me for an ultrasound. I was then referred for a non uptake scan which came back "no hot or cold nodules" I was told that if it would make me feel better he could do a biopsy or I could come back in a couple months and see if the nodule had gotten any larger. My appt. is scheduled for 2/25 but recently I have been extremely fatigued, nausea and dizziness almost all the time especially when I bend over or get up too fast, and I fainted for the first time in my life 2 days ago while I was standing up and had been standing for over 5 minutes. I will also mention that I have had 4 miscarriages in the last 1 1/2 yrs. Unable to get past the 7 week mark. I have been on glucophage for over 3 years but dosage was lowered and I was taken off of it last week. My blood sugars have been running in the 60's on occasion but on the day I fainted, my husband checked and they were 103. I went to the ER after fainting because I hit my head when I fell, a head CT was done, ekg, cardiac enzyme, CBC, urine test, all were normal. AIC was 5.4, and TSH 2.09. I will also mention that I have effortlessly lost approximately 30 lbs since August. All the doctors keep telling me everything is normal, yet I feel so tired all the time. I have never fainted before and I am so scared that it will happen again. On top of everything my husband and I have been desperately trying to have a baby and I can't help but wonder if whatever is going on is the cause.