Low waking temps, general lethargy, could it be hypo?

[thezynmaster]

Symptoms
I have been checking my temps for the past few weeks and they have consistently been ~96.3-96.7 every morning. I have always been extremely sluggish to wake up in the morning, even in periods of consistent sleep/wake times. (Note on this: I have struggled with oversleeping for as long as I can remember, waking up around 7 AM naturally, then falling back asleep and sleeping until 9 or 10. I have not found an answer for this or reasonable explanation for the sluggishness I feel as a result of it. I assume the most plausible explanations are a) circadian rhythm dysfunction or b) metabolic dysfunction.) Bouts of fatigue and brain fog reliably appear every afternoon.
I feel my energy and mental performance are far below what they should be for my age. Could this be an indicator of low thryroid function?

Other relevant info: Male, 20 years old, train BJJ 6x/week, eat pro-metabolically as my university dining plan allows. Also have Pectus Excavatum which led me to develop poor posture and breathing habits which I have been actively correcting.
Supplements: Creatine, Bayer Aspirin, Thorne Basic-B Complex, 100 mg TTFD, D3&MK-7, Trace Minerals Iodine drops (recently added), L-Theanine 200-400 mg as I need, occasional NAC. Pansterone 3 drops twice a day, Androsterone 1 drop twice per day with application of Pansterone.
Medications: Adderall 20-30 mg/day. A note on this: started last summer, my symptoms have persisted long before the addition of amphetamine. I understand it is an excitatory compound and stresses the organism. That said, I am treating it as a temporal bandage as I resolve my symptoms. Difference in work output and adherence to goals is night and day, even if it is merely masking the symptoms of underlying metabolic dysfunction. Adderall suppressed my nicotine cravings (similar mechanisms) enough for me to quit last summer, fwiw.

Overall, I believe its a confluence of a few things, 1) Stress of school, 2) subobtimal sleep (usually get 7-8 hours per night, but not consistently timed), 3) Overtraining and undereating, 4) Micronutrient deficiencies.
I'd like to find a solution before taking thyroid, however I have been tempted to try Cynomel (or other similar product) to confirm a self-diagnosis in the event of a regression of symptoms.

I intend on purchasing Barnes's Hypothyroidism: The Unsuspected Illness and Selye's The Stress of Life to form a more coherent, holistic perspective of my condition from two great influences and peers of Ray.

Any advice is greatly appreciated