Why is it hard to breath and have really bad nasal congestion. Plus little red bumps on skin.?

I have recently been very congested and have had trouble breathing. it feels like something is stuck in my throat sometimes and when i blow my nose nothing comes out. Also i have been getting these little red bumps on my skin and they cause me no discomfort at all. im thinking it could just be allergies, but im not sure. PLEASE someone help. i havnt been able to get any sleep for the past few days because i cant breath through my nose and its hard to breath through my mouth.