Is This Menopause?

Question

I am turning 40 and just been recovered from 12 years anorexia. While my cycles have been regular, I am beginning to wonder if I might be experiencing early onset of menopause. For the last 7 or 8 months, I have experienced odd things. It started with some vertigo which one ENT specialist said that it was due to ear infection. Another doctor told me that my sinusitis is drying out so I got a netipot, which did not make any difference. It eventually went away after months. Now, I am having crash fatigue in every day basis, which only last for an hour or so. I could not open my eyes, get heart palpitations and I would freak out because I could not figure out what was going on. Sometimes, I woke up in the middle of the night, drenched in sweat despite I am wearing shirt and shorts only. Worst thing that happen to me is I am getting so forgetful. I forgot almost everything which I am supposedly know at heart. Are these symptoms of menopause? Will these go away?