I know that it's really difficult to believe that declining hormone levels could cause all these symptoms, but if you have the opportunity to read some of the posts here you will see that you are not alone.
Did the doctors also check your thyroids? It's good that you've had a series of tests to rule out other possibilities, this should give your some peace of mind. It's good to know that your doctors at least attributed these symptoms to perimenopause...you must have some excellent doctors.
You've come to a good place for a wealth of information and support. I hope that you find relief from these symptoms soon.