What Causes Dizziness While Suffering From Epstein-Barr?

Hi, I was diagnosed last year with pityriasis rosea after developing a stubborn rash that looked link pink leopard prints all over my body. I had been feeling extremely unwell, drowsy, achy etc, I had various blood tests and the only thing that came back was epstein barr. The doc was convinced this is what caused the rash. Since I had this mysterious illness I have still not felt "right". On week I may be full of energy, the next I am completely down in the dumps and am mentally and pyshically exhausted. The doctor prescribed me citalopram 10mg last year. It did make a big difference to my mood but physically I would stil be exhausted. I was also and am still not depressed. I do not understand why I Feel this way? I try to exercise regularly but some days I just can't manage, I eat healthily and am a healthy weight.