My uterus is 8.3*5.1*3.6 cm is it normal?

It is normal and a dry is common during the menopause and as your periods have not been for last two months I would say it is the start of the menopause. You will find that you might get periods for the next few months and then miss a few and then nothing for 6 months and then two. This will go on for a few years and usually starts around 52 years old like mine did, I was ok with mood swings but the constant sweating was terrible and the doctor would not give me HRT because my sister had cancer but has given me medication called Dixirit and they help the constant sweating. You should google the menopause for all the symptoms but remember you can still get pregnant until you have not had a period for 12 months. Good Luck