Lump on cervical spine. (Back of neck)

Hi. 

I was wondering if anyone has been through the same as me. 

Back in September I had a sudden severe head pain which I was rushed to hospital it was that bad.  They check me over and decided to do a CT scan on my head which was clear. And also decided to do a lumbar puncture for meningitis which was also clear and I was discharged..I then had severe headaches and weakness down the left side.of my body arm.and leg which felt like sciatica.  

Was admitted again and gave a CT with dye to check the veins ana arteries. All.clear. 

I have now found a lump on the back of my neck which was small.and grown now within a week. It's makes me feel dizzy of pressed hard and it does move slightly.  I have daily nausea and still weakness in my arms and left leg. 

I have an MRI Sunday and my nerves are gone. I have a toddler and petrified it's something more sinister than a cyst or fatty lump.