General health-fevers, UTI, cyst on neck

I had dengue on 24th September and I was normal on 12th October. but since then I feel very low of energy. I am getting fevers Everytime if I do exertion or go out somewhere. my throat is always bad. sometimes I feel I have congestion when I am out or in the cab. I am prone to UTI more often than before. I also got cyst on my neck, I visited doctor last week and he gave me medicine. it is still there but the size is reduced. soon after I ended my medicine course of 4 days I got fever the other day. Now I am suffering from fever since yesterday. I had stomachache as well I got fresh in the evening again yesterday and in the morning I had vomiting soon after I got fresh. My periods have also started. please suggest what should I do.