We need to know what you're taking, and yes, this should have been pre-planned. A wise man told me when I started, "no SERM, no cycle."
That said, my general $0.02 is that exemestane is easier on the body overall than anastrazole. None of them are great for your cholesterol because they are designed to effect estrogen. Make sure to stay away from too many refined carbs/sugars on cycle to help with cholesterol.
This is just general till we find out your cycle. For all we know, you should be taking an AI on cycle. Also, forewarning; everyone is different. I have very sensitive glands and have had to use much stronger aromatase inhibitors than most people have on equivalent cycles of certain compounds. Listen to your body.