Stuffy nose short of air o2 been in the low 90's when coughing I taste snot discomfortpain- in chest when breathing in deep y is this?

You've got infection. Most likely pneumonia. There are other possibilities as well. Your underlying medical issues of diabetes, severe asthma, GERD, and possibly diabetic neuropathy affecting the GI tract and mobility puts you at very high risk for pneumonia. A chest X-ray is needed, amongst other things. It sounds like you are sick enough to need treatment in the ER. I think you should be evaluated now. Get going ASAP.