Don't panic! You're readings aren't all that bad! Any idea where your nitrites and nitrates are at? Temp? Salinity? Blood alcohol le...oh heck, sorry! That's for me!!
Since it's only been three months or so it might still be cycling. When did you add liverock and livestock? If you added all that at once or too quickly it might just be that you had some bacteria from the original cycling but all the extra critters are putting off more ammonia than your current bacteria can handle.
Watch your ammonia, nitrite, and nitrate levels VERY closely for awhile!! If the ammonia starts to go up too high (at least higher than 1.0) do a small water change to bring it back down. The bacteria will multiply to where they can handle the bioload. Just hang in there!