Low grade fever could be part of any flu-like illness. If it is not rising above 100 degree Fahrenheit without any medication, it may resolve on its own in a couple of days. Observe and see the pattern. If there is any associated symptom in the next few days like worsening fever, cough, weight loss, diarrhea, rash, swollen lymph glands etc. then do consult a general physician. The pain in the elbow may be related to repetitive stress due to working on a computer.