Do I have depression or Anxiety?

I am not sure what to ask. I have been feeling depressed and felt like I am going to die due to some symptoms I have been having. In July I got sick with the cold and my 1st ER visit was that I had the flu, my second visit was that I had a viral infection even though the doctor just listen to my symptoms, my 3rd visit the doctor didn't find anything and it might just be a virus infection that can be cured with home remedies etc. For awhile I felt better but in my mind I feel like I am sick with something and I am going to die, either catch a heart attack or die of brain damage. It started stressing me out, scared to go to sleep and not wake up and I kept staying up until the late hrs or break night. Now I am feeling head pressure, my left eye hurts and sometimes my chest hurts and I feel like I have something stuck in my throat. My muscles have been spamming, jerking non stop and pain in my legs. I have been having earache. 3 days ago I went to ER and doctor said I had a sinus infection and Costochondris (Not sure if I am spelling it right) and he gave me antibiotics for 2 weeks. I have lost interests in things that I used to love, I cannot draw up anything meaningful that used to matter, sometimes I am staring blank or it just hurts to think. I keep thinking that I am going to go brain dead or catch a heart. I just went to a psychologist for the first time a day ago and we just did an evaluation. Can someone help me? Tell me anything? Why am I losing my mind, can't think straight and cannot focus on listening to music or reading and I am always on the computer researching my symptoms.

[Bubulous]

I am glad to hear you are looking up your symptoms.  Be careful, however, not to diagnose yourself.  This website has a great mood tracker.  Use it and journal every day about your thoughts and feelings.  When these things are wrote on paper you subconscious and conscious mind get to team up and work on fixing your problems.  You are beginning a journey that can be won.  Hold your head up and if you are placed on medication:

Take it as prescribed, learn everything you can about it, and if it doesn't work do not stop just get switched to something else.

Good luck and welcome to the Forum.