What To Do When Red Rashes Develop On Limbs, Chest, Torso Around The Time Of Sinusitis Which Is Not Going Away By Levequin As Usual?

Within the last 24 hours I have developed what I assume to be the common cold; sore throat which has improved, sneezing, runny nose, slight dry cough and stuffiness. Had a horrible time sleeping last night and noticed a red rash developed on my back, back of arms down to elbow, back of legs and inner thighs. It started to spread around chest and torso. I have taken no prescription meds and only OTC meds such as musinex which I ve taken many times before with no problem. In the past yer I have developed a rash when I had a sinus infection nd was prescribed Levequin. Which I took many times before as well. My PCP thought or some odd reason I developed a rash fom the Levequin, however I now have a rash tht does not itch but uncomfortable and I m on no medications. I question if I should go o the ER or if my symptoms are causing this and what I can do for it? The pattern is hen I get something related to sinuses or head cold I am getting this...approx third time but this is the most severe. Thank you- Gwen in MD