What is it that makes you think that it's not peri causing your symptoms? Periods become irregular, shorter, longer, heavier or lighter and then can go back to being regular. Flushes often stop when you are building up to a period only to start up again when the period has finished. In my case I went without any sign of periods for nine months before they started up again and were regular for four months before stopping for six months then starting up again. Peri can last for around eight years. Poor sleep i.e. not being able to get to sleep or waking after a few hours is also very common
Hope you get on ok at the doctor's.
Taz x