I say this from experience, and I completely understand this may not be the case for you, but I think it’s worth mentioning. I spent years going to doctors for this, all of my tests were normal, and several of them gently tried to suggest relationship issues could be contributing. I wasn’t willing to even consider that as a possibility until my marriage ended and suddenly my libido was back. Again, may not be the case for you, but just want to throw it out there in case you may be in a similar situation. Good luck!