Can Medication For Hypothyroidism Cause Pressure In Head And Sore Muscles?

I have been diagnosed with hypothyroidism and taking levothyroxine for 6 yrs. I have lost 30 lbs, intentionally, and my rt eye started bulging around dec. My blood work for the last # months shows TSH .008, .018 and then .025. Endo has me getting an MRI this friday for a tumor. I still think thyroid med needs adjusted and all they talk is about tumor.I have constant pressure in my head and sore muscles, confusion, and memory loss. What do you think?