To be honest, stopping the pill whatever age you are can muck everything up in terms of cycle and bleeding for a good 3 months at least.
Then peri-menopause itself leads to weird bleeding patterns - heavy, unpredictable, lighter - just random.
So all that is pretty normal, which doesn't mean it's pleasant or you have to accept it. You could try the Mirena coil, which has a smaller amount of progesterone in it than the mini pill and it's local in the uterus so much much less of it gets into the blood stream than the mini pill. Most women don't bleed at all with the Mirena after the first 3-6 months and you can keep it in for 5 years so would see you through until menopause....