It may be useful for you to take tests: amino acids in blood and urine (the widest list), vitamin B3 (niacin and nicotinamide), and, if available, tests for metabolites of tryptophan, serotonin and catecholamines (urine, It is better to do the daily urine, 24h) (!!!), advanced urine analysis for organic acids.
All this in one day. It is better to take it in a state of POIS and in a completely healthy state (twice, the same).
It all needs to be handed over in one day.
These tests can be informative for correcting your diet and other disorders.
Do not take any supplements/tablets for 5-7 days. Even longer is better.
If you do it, post it here.
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You can also do: fadiatop IgE (!), eosinophilic cationic protein (!), prolactin (!), testosterone, estradiol, TNF-a.
Calcium, magnesium, potassium, sodium, chlorine, phosphorus in the blood and daily urine. Zinc, copper, selenium in blood and urine.
Check the prolactin necessarily. Low testosterone may be because of this.
Steroid profile in saliva (as many hormones as possible).