Thyroid labs look good,
but do test oral body temperatures as per the thyroid basics sticky.
Starvation and starvation diets are <<>>. Can increase rT3 that blocks fT3 and the metabolism and body temperature can suffer. If your body temps are low, that can be from elevated rT3, see the sticky and look for Wilson’s Book.
If body temps are low, that is a significant part of your problem.
Doing hard workouts by sheer will-power, mind over body, when your body is otherwise run down [low metabolism] can may things worse.
LH/FSH can be considered to be a follow up to low T and you did not get there in the doc’s eyes.
25mg DHEA
5,000iu vit-D3
a good high potency B-complex multi-vit that lists trace elements including iodine and selenium
From your labs. Please list with ranges:
RBC
hemoglobin
hematocrit HTC
fasting cholesterol
fasting glucose
A1C to eval average glucose
You are currently somewhat estrogen dominant and reducing E2 would help increase TT and FT.