Shortness of breath for more than 5 days, normal oximetry 98%. i suffer from anxiety and am afraid. could it be something serious?

Shortness of breath is not normal, unless it is the mild temporary shortness of breath with sports activities (but even then, one must be sure she is not having more shortness of breath than her sports peers have). Possible reasons for shortness of breath in a 30's adult include anxiety, asthma, allergies, heart arrhythmia, heart failure, fluid around the heart or lungs, costochondritis, etc...

COVID-19 should be rules out. Your anxiety may be related but I agree other causes such as a cardiac condition warrants further evaluation. If you have wheezing and cough, asthma is probable.