Effects of ME/CFS on mathematical ability

So I did an aptitude test 2 days ago for mature aged students university entry, which was supposed to test my verbal and quantitative reasoning skills. Although I managed to answer most of the verbal reasoning questions with minimal difficulty, I found it particularly challenging to understand many of the quantitative reasoning question, especially those regarding spatial relations and patterns. This is an area I never had trouble with prior to developing CFS/ME. It's as if the part of my brain that processes mathematical relationships has been damaged. I could not see the relevance of some parts of information to the questions asked, no matter how hard I tried to understand the relationship. This left most of the quantitative reasoning questions unanswered and has likely halved what my score would have otherwise been. It is unlikely I'll be accepted into uni, and it is very emotionally challenging to deal with the fact that my mental faculties have deteriorated so profoundly over the past few years. I feel very isolated, inept and vulnerable.