Effects of breaking Celiac diet ?

I have been feeling unwell on and off for approx 3 months now, I dislocated my shoulder in August and I think this triggered a bit on Anxiety since then I now feel very very tired most of the time I also feel quite shaky sometimes, I went for a walk today and felt very dizzy and shaky, I am also a Coeliac and wondered how it would affect me if I ate something I shouldn't, I really do feel very strange a lot of the time, please can you give me some advice? Thank you. Mandy