"Then this result on a blood test wouldn't necessarily be related to a tick borne illness?"
Correct. Though Lyme/coinfections could very well use up iron and/or block absorption of iron from your diet.
"Maybe doing something to help the thyroid could give me that energy boost and get my immune system back on track?"
Possibly. Many with Lyme have thyroid issues.
Chronic Lyme Disease, Chronic Bartonella (clinical dx only), Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, chronic Lymphopenia, etc.; G-Tube; Currently trying to wean off TPN.
Meds: Pulmicort, IV Ceftazidime, Heparin (to flush PICC line), Claritin, Domperidone, Colloidal Silver (used topically), probiotics, Milk Thistle, homeopathy.