What Could Cause Growing Lump In Neck Causing Bad Headache, Loss Of Feeling In Left Hand With Pain In Left Side Of Body?

I have a very scary problem, I have this lump growin in my neck on the left side causes terrible headaches I lose the feeling in my left hand due to severe pain also gives me bad spine and leg pain all on the left side even when I try swollowing the left side is sore. I hve good days and terrible days went to the doc they running many tests and its making me even more scared plz could you tel me what these tests mean? LN biopsy,cervical triangle lymph nodes,fnac,sputum afb,gene expert, tb culture,mountox and what are these following blood tests done for? Ctb,cxr and US and next month they doin a brain and neck scan and they going to put a dye into my vein please could I have help understanding I m really worried............... Many thanks