Does Tender Spleen Cause Pain Under Ribs While Getting Ivs?

I m a male 47 y/o. X-Mas Eve of 12/08 was hit head on in a mini van & had multiple injuries: crushed Rt leg; etc. Since I ve had pain in my Lt side under my ribs. At times it wakes me from sleeping. I was recently bit by a brown recluse requiring hospital admission, IV antibiotic & f/u home care. When I get IVs... I can t stand the pain under my Lt. ribs. My friend is trauma RN... said spleen injury is common in accidents, normal spleen is full of extra blood & fluids & maybe IV fluid is adding to much fluid into a tender spleen... & that I need doctors hand on my belly to decide if an ultrasound or other tests are warranted. It this a logical? Is a bruised spleen tender this long after an injury? Thanks