--you mentioned you are hypothyroid--and that alone can casue many metabolic "slowness" problems, including the slowing of the enzymatic reactions that are necessary for ful usage of vitamins and minerals.

Are you on any thyroid hormone replacement? (Some people to much better on certain types of replacement hormone than others--your dosage and/or form--T3 vs. T4--may need to be optimized.) Do you get regular TSH levesl done? (And how were you diagnosed?)