Honestly, if you can get a ct scan and full bloodwork which can also check your horomone levels too, then try to get that all done so you can eliminate some things. If you have the blood work done, get a lyme disease check as you did and do a lot of walking out doors. A doctor I saw once tested me as she said a lot of people actually suffer from lyme disease not even realizing it or noticing a tick had been on them. I even had a friend that struggled for a few years, turned out to be lyme disease and she did not realize or see a tick on her, they can be very small and go unnoticed and often they come in from hitching a ride on our dogs too.