How long do side effects normally last with Prozac?

I know I have asked a lot of questions about the Prozac. And I am an impatient patient. My therapist and doc just love me. They do. I had a hormone imbalance(menopause) and a pdoc that thought I should be OD on some anxiety meds(Depakote) and Lexapro, which created some really weird problems. Anyway, thank God for mental health and an obgyn. I have thyroid disorder too. So, making a long story short, I have had every side effect thus for to the ADs. And just this week the dizziness(you know when you get up from laying down or sitting too long) that comes with Prozac started, and at night, I still am like getting up(eyes opening) twice a night. I still have some nervousness/anxiety(physical) and the headaches in the back (tension, hormone). I am on 20 mg of PRozac a day. I am just now in the middle of week 8, and Thursday will be week 9. There have been some major improvements and there are days where my body feels crappy. Doc says SEs. Guess I will have to live with. What about you all