Sex drive is affected by more than testosterone levels. Have you any new medications, or have you changed doses of any medications? Has your life routine changed in any major way (sleep, work, exercise, diet, new or increased stress, what-have-you)? Has your mood otherwise been good or is that different? How's the dysphoria been?
My libido was high for awhile but has tapered off a lot. Lower dysphoria works a number on my head so I'm glad it's decreased.
Lack of sex drive isn't, in itself, necessarily a problem. But if you want a sex drive, have you tried porn? Personally, if that were my circumstance (wanting sex drive but having none) I'd try options like porn or toys before going to a doctor.