I think I may have hypothyroidism and Addisons :( not sure...

So, I see a lot of people also have hypothyroid...I have my thyroid checked every 2 years for another genetic disorder that predisposes me to getting adenoma on my thyroid. I have a small nodule that was seen "incidentally" on my last ct scan. But, I have ALL of the symptoms of hypothyroid (and a bunch of other symptoms that are a mystery until I see audiology and neurology this month)...anyways my T4 serum has never been above 0.8 (range 0.6 - 1.2ngdL) but like it was this month when it was 0.6 is where it usually is and my TSH last time it was tested this month it was 3.57 (range is 0.34 - 5.60mcIu/mL) it was 5.34 in july of this year. I also have to go in and have ferritin infusions because my levels wont stay in the normal range...also have Vitamin B12 deficiency and Vit D deficiency...the dr's have always treated these as separate issues, but the more I research addisons and increased rate of hypothyroid I am wondering if that is the case...My endo never listens to me so I think I'm going to just the neurologist I see on the 18th...but was wanting to know what others here thought here first...