Your thyroid labs could very well explain why you feel like you're dying.
And, kudos to your doctor for offering the thyroid meds you clearly need in spite of your "normal" (aka in-range TSH). All too many doctors get distracted by a "normal" TSH and miss obvious cases of hypothyroidism. (TSH is a pituitary hormone involved in thyroid hormone metabolism. Looking at TSH to judge thyroid status is like looking at the odometer when trying to figure out how much gas is in your tank)
The Free T4 and Free T3 tests you had done measure the levels of thyroid hormone that are available for use by the body. They are the levels to watch throughout thyroid treatment. Again, kudos to your doctor for recognizing what you need.
Healthy people have Free T4 and Free T3 levels in the upper quarter of the reference range.
Based upon your lab's ranges, this means a healthy person will have a Free T4 level of at least 1.6 and often higher - you can see that your level is .96.
That same healthy person will have a Free T3 level of at least 3.8 and often higher - you can see that your level is 2.9.
Cytomel is a synthetic T3 med and the dose you were taking clearly isn't doing much of anything since your Free T3 level is still near the bottom end of the range.
Nature Throid is a popular desiccated thyroid product. By the very nature of it (porcine thyroid), it contains proportionately more T3 than T4 compared to human thyroid.
Many people feel great on NatureThroid - others find the need to add some T4 (levothyroxine) to achieve a healthy Free T4 level. Both levels need to be adequate if the patient is to be free from thyroid symptoms.
Thyroid meds need to be slowly titrated to allow the body time to adjust to the new amounts of thyroid hormone that were desperately needed by the body.
I'm guessing that your doctor selected 3/4 grain as your starting dose because it contains a similar amount of T3 as the Cytomel you were taking.
Treating an underactive thyroid takes time. We pick a starting dose, get labs within 3-4 weeks and then usually get a needed dose increase. Wash, rinse, repeat until the Free T4 *and* Free T3 levels are similar to what a healthy person will have.
Here's some info on DHEA:
www.lifeextension.com/protocols/metabolic-health/dhea-restoration/Page-01If I was in your situation, I'd start one med first and start the other one the following week just to gauge response.
Please understand that starting thyroid meds can sometimes make us feel worse before we feel better....especially if dose increases don't happen fast enough (every 3-4 wks.).
When does your doctor want you to come back for labs?