I have been dealing with insomnia, a cough, loss of appetite, fatigue, sensitivity to light and weakness for over a month. what may this be?

Symptoms: The collection of these symptoms is difficult to address without a good history and examination, More details are needed to understand "weakness and sensitivity to light. Weakness is especially vague; it can be depression, anemia, infection, muscle weakness, low energy, low glucose, dehydration, mineral imbalance, and the list goes on and on. See a doctor in person