i suggest you return to your health care provider for a re-check. you could be experiencing a new illness that's unrelated to the sinus infection. or perhaps it wasn't a sinus infection after all but a virus that has now gone down into your lungs. regardless if you're having trouble breathing it's worth getting checked out. hope this helps!
recently developed some breathing issues and have a soreness of lungsany possibilities. have had sinus infection recently but got over that but about 2 weeks later started having trouble breathing. no cough no injuries