Can Low TSH Levels Cause Morning Sickness, Cramping, Abdominal Pain, Lightheadedness And Chills?

Question: I am a 69 year old white female that had radio active iodine treatment when I was 21 for hyperthyroidism and have been on synthyroid ever since. About 2 years ago I got sick, seems my thyroid was out of whack. After med corrected still very sick even though my numbers were normal. Flu like feeling, morning sickness, lack of appetite, cramping, multiple vowel movements, abdominal pain, pressure after eating, chills, weepy, light headed. Both my endocrinologists said it's not my thyroid, go to see a gastroenterologist. After follow up test my TSH showed up low and blood pressure was in stroke territory so my GP lowed my dose considerably. Started to feel better, but after 6 weeks now my TSH is on the high side (15). My endocrinologist raised my dosage up and after about 3 weeks started to feel sick again. My question is is it possible that I feel better with a high TSH and maybe after a longer time it would sort itself out. I am meeting people who say that their doctors said if you feel OK that's the main thing but my endocrinologist said it's bad for your heart. That last few days I decided not to take a pill for a couple of days and then go back in the lower dose of 50 from 75 originally 88. I already feel better.
I have had 2 CT scans, colonoscopy, vaginal and abdominal ultra sound and nuclear scan on my thyroid. Autoimmune thyroiditis. I have gone gluten, dairy, corn, soy and nut free. A massive amount of blood testing everything seems fine. I am waiting for an appointment to see a gastroenterologist.
Thank you