So sorry that you are going thru this, @Pommy8 - I think we can all relate to anxiety that you are going thru xx Any rise in the 'acceptable numbers' is always of concern :( and yes, totally scary, specially when your GP tells you to go immediately to ER :(
I've had huge CRP numbers in the past (my GP used to check it all the time) - even before I was diagnosed with BC ..... if you have any sort of arthritis (as I do) it can contribute to the high CRP numbers ..... they also put my onto Vioxx (anti inflam) when I injured my hip and it alone, sent my numbers sky high & also stuffed my liver - so much so, they thought I was an alcoholic, the numbers were so high ....
I hope everything settles for you - and good luck with your lung & spleen tests xx. Big hugs. Take care