I'm not sure what this is but for the past few days sometimes when I take a deep breath I feel a strange wheezing sensation in the middle of my chest. It doesn't happen everytime, maybe a few times a day. I don't think I'm having any issue with breathing itself, don't feel out of breath etc. The only other symptom I have is I've been quite mucusy lately and need to clear my nose often. What could it be?