Get your original loan offer, what rate over ECB was your tracker guaranteed to remain at? The rate of 5.5% that you were offered in 2008 sounds very high so I wonder what if any percentage over ECB was guaranteed.
As for not advising you in 2008 that you may not get the option of a tracker that is also true of fixed rates, had you asked could you fix again in 2011 the answer would have been yes if there are fixed rates there at that time. If trackers were still there you probably would be offered one but they are not, however the important bit of a tracker is the percentage over ECB, if that is high then there is no point having one either.