Hello, I Was Recently Hospitalized For The Worst Headache, Sweats,

Hello, I was recently hospitalized for the worst headache, sweats, throwing up. I am 60 and never had headaches. I have had 5 this year which required ER visits. The last two i was admitted for a week. They did tests and thought it was a spinal leak due to a recent block done on my lower back. But the orthoped said that was not the cause and disagreed with Neurologist. They found a 7mm nodule in my lung, high white blood count, high D-Dimer. I have no diagnosis and am petrified for the next head ache I may not survive. Not sure what to do next.