What Causes Constant Fatigue, Fainting, Vomiting And Headaches?

Hello, I have been having health issues for a while and would like to know more about what could potentially be the cause. In November, I had been experiencing constant fatigue and lack of energy for several months and then ended up passing out, vomitting constantly for 4 days, and had terrible headaches, chills, and night sweats. I had a CBC done at urgent care and it came back with slightly elevated platelet levels. I ended up passing out one night, and my doctor had me admitted to the ER suspicious of a brain tumor or that it might have been a seizure, and they ran a series of tests, all coming back showing everything is normal. My primary decided that it was probably just something like West Nile and would go away in a few months. He gave me steroids and something for the headaches. The majority of my symptoms went away, aside from the fatigue which has been a constant. A few weeks ago I started having what I assumed were allergy symptoms, swollen throat and hands, my nose had been stuffy. I took Zyrtec to get rid of the allergy symptoms, but it didn t seem to help with anything aside from the stuffy nose. I then started to get a ton of small, reddish looking bruises on my skin. They don t feel like a rash and don t itch, but hurt like bruises. My hands are swollen, it is difficult and painful to swallow, and I have more and more bruises every day. Urgent care ordered a CBC which came back all normal. I am afraid my doctor will simply dismiss this as allergies or something, but it feels like somthing is seriously wrong. Could this be connected to what was happening in November?