Schizophrenia or anxiety

4 weeks ago I stopped marijuana use. However two weeks ago I had an overwhelming feeling I was dreaming because I lost my short term memory. I knew I wasn't but it was an overwhelming intrusive thought. I went to the doctor and got a cat scan an EKG as well as X-rays for my chest and blood work. The only abnormality my doctor told me about was chronic sinusitis. She also scheduled me for ears nose and throat doctor next week. My stress has been high from all this and I have been having anxiety attacks. I have started to have delusional thoughts of whether everyone else exists. I feel disconnected from my own body and reality. I'll feel as if I am going to faint and hear voices and have noticed when I talk it sounds different and I can't put emotion into my voice. When I passed a sign yesterday it said something like need help with stress and anxiety call xxx. It felt like it was put there for me to see. I seem to have developed agoraphobia. My mind feels foggy and my ears feel stuffed. I was wondering of you think I am becomming a paranoid schozophrenic or if this is a result of stress, anxiety, loss of apeptite, insomnia, chronic sinusitis, inner ear infection, and Marijuana withdrawl?

These feelings are not overwhelming right now and it doesn't feel as if I believe them.