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This is Dr. David
I am sorry about your low sex libido
sometimes lack of exercise can cause loss of sex drive. are you exercising regularly?
your autoimmune disorder could be also causing you loss of sex drive.
when did you feel that your sex drive was "normal"
sometimes high sex binding hormone blood levels can bind too much testosterone and cause it to not function properly.
pituitary LH and FSH levels also control testicular testosterone and sperm production. these levels should be checked as well
let me know if you have questions.