Nervous I might have lymphoma

Here is my story
I'm a 19/F and back in September I would get a wet congested cough where I was very wheezy and could barely breath, with no other symptoms in the middle of the night, I would wake up fine the next morning. These episodes would occur randomly throughout the week. I started lexapro in October to help my anxiety and had extreme itchiness that caused hives, thought I was allergic so I switched to prozac. My itchiness is coming back and I find random bruises on my body. I have hard nodules under my armpits, I know these are possible symptoms of lymphoma and I am worrying myself sick.