I've been feeling really unwell since May. It started with mild pain in the upper center of my chest, then turned into a high fever. By the 17th, I lost my taste and smell. Soon after, I noticed mild chest pain right in the center along with shortness of breath, but these weren't everyday occurrences. Strangely enough, these symptoms appeared again about 34 days later, and now they're back from June 23. This time, the pain has shifted a bit to the left and I'm having trouble breathing. Is this something serious? Could you please give me some advice?