If 4000 IU is giving you a Vitamin D level of 40, then an increase of 1000 IU should get you up to 50.
I thought I sent a reply, but noticed it did not show up. Vitamin D is important for you. What I wanted ot mention is that Vitamin D should be at least 50, so I suggest taking 1000 IU of D3 daily to increase your level.
Oh I meant to mention that hypothyroidism can cause numerous symptoms. From a very long list of symptoms, following are those which fall in the category of emotional.
Emotional:
Tension
Irritability
Wanting to be solitary
Mood swings
Anxiety
Personality changes
Feelings of resentment
Jumpy
Easily startled
Lack of confidence
Nervousness
I am not sure why your thyroid levels previously increased as you increased your ferritin levels, so to get you feeling better sooner, I think I would do both: go back to the previous dosage and also start taking iron supplements. There is a very good source of iron called Vitron C, and also some generics that cost less. I suggest taking one pill daily (65 mg of iron), and get ferritin tested when you go back. Even with all that I doubt that your 7f5 mcg of T4 is going to be enough to alleviate symptoms. But we will know more after your next tests.
What are your Vitamin D and B12 levels?
From your test results, your med dosages, and your symptoms, it seems clear that you have always been under-medicated. At no time have your FT4 and TT3 been around mid-range at the same time. In addition it is important to know that the ranges are far too broad, and skewed to the low end, since they are not based on adults with no thyroid pathology. Instead only patient data with a high TSH are excluded. So patients with central hypothyroidism and also hypothyroid patients under treatment all are included in the database used to establish ranges for FT4 and FT3 (and TT3). Accordingly, test results in the low end of the range are even worse than they appear.
Even if the ranges were more representative of euthyroidism, everyone is different in the levels of thyroid hormone at which they feel normal. So you cannot target specific FT4 and FT3 levels, without taking into consideration symptoms. Hypo patients go to their doctor because of having symptoms. Biochemical tests only help to determine cause. The objective has to be to relieve hypo symptoms. Many of us have found that to require FTR4 around mid-range, and FT3 in the upper half of the range, and adjusted from there as needed to relieve hypo symptoms. So you need med increases to raise your FT4 and FT3 levels.
In addition, if you will click on my name and then scroll down to my journal, you will see an Overview of a paper on Diagnosis and Treatment of Hypothyroidism: a Patient's Perspective. In the full paper you can find info showing that ferritin should be at least 100. Your level is horribly low. Low ferritin can cause the following symptoms.
achiness. weakness, fatigue, dizziness, headaches, faster heart rate, hair loss, foggy thinking, memory problems, loss of sex drive, depression, increased irritability, heartburn, abdominal pain, numbness or tingling of extremities.
There is a lot to discuss, but first, please tell us what med and dosage you were on at each of those times when you were tested. Also, do you take your thyroid med in the morning before a blood draw?