I have always preferred aromasin over adex and letro as it gave me less sides and pain. Letro really dried out my joints and killed my libido.
You shouldn't be taking an AI unless you are exhibiting signs of what the AI is supposed to be for. i.e. like gyno. Too many people rely on AIs for things like fighting water retention which shouldn't be occurring with a proper diet. If you are not having gyno problems or the like, don't use an AI at all. But if you do want to continue to use it, take half a tab every 3rd day.
You really don't want to grind all the estrogen out of your body anyway. Believe it or not, there are still some uses for the estrogen that body has need of every day.

People assume they will need a consistent AI through a cycle but it is not always necessary. This happens all the time where people crash there estrogen and feel like shit. Use HCG if you have it to raise your levels 500ius to start wait two days and see where you are at.

Try adex, it's much easier to dose. It will not make you feel like shit either. Less sides, don't have to take daily, it blows my mind why everyone isn't using it. But there are some who love asin, ultimately it comes down to which works best for you.

Blood work is the best way to know.. high estrogen can make you feel like crap too.. and what week are you in? you shouldn't need an AI for a test E cycle til around week 4

yep, thats to much aromasin for a test e only cycle!! sounds like you killed your estrogen, back off the ai for a couple of weeks see if you feel better, then if needed add the aromasin back in @ 6.5 eod, you may not need it at all though.

How do you know they are down?
How long have you been on cycle?
How much are you using?
What exactly do you mean when you say you feel like shit?
If you tell us exactly how you are feeling (symptoms) i may be able to give you some advice
But as TJ says, getting bloods would be ideal.