What Causes Dizziness, Night Sweats, Fatigue, Loss Of Appetite And High BP?

Hello, I am having a lot of different symptoms over the last few days. They include night sweats, fever, chills, fatigue, thirst, loss of appetite, sleeping more and more, cramps in hands and legs,etc. I also have high blood pressure which the doctor has increased my medication. The worst symptom is onset of dizziness after work, around 5 PM until I go to bed. I am worried but my local doctor doesn t seem too concerned. What could be wrong with me?