I have had a cold and mild bronchitis (pennicillium), seemed to get almost better, then down two days later with sore throat, small red spots on the roof of the mouth, swolen glands under and in front of ears, malaise (went to bed - rare). Age 64, had glandular fever and cytomegilla virus many years ago. Have multiple other autoimmume problems including mild lupus
You need to take antibiotics like azithromycin after consultation with your doctor as swollen lymph nodes are also there.