In isolation the last two sets of test results do point to primary hypogonadism. What bothers me is that testicular function appears to have been fine in February. In the absence of some acute illness or injury that seems like a pretty short time frame in which to lose testicular function. I wouldn't consider the diagnosis definitive, but you do need to do something, as it's not healthy to remain in such a hypogonadal state. Have you had more comprehensive lab work to rule out health problems that may be connected, e.g. thyroid status, vitamin D level, etc.? If you are otherwise healthy then I suppose the main choice is between another run with Clomid—or preferably enclomiphene—or else resort to TRT.
If you are not predisposed to androgenic alopecia then TRT will not cause hair loss. If you are so predisposed then TRT can potentially accelerate the process, but you would probably lose hair even without TRT.
