Pain around left rib total mystery?

Ok my left rib has had a small lump that has been in pain for now going on 3 months. I have seen a doctor 3 times and had an ultra sound, CT scan, and chest X-ray and the doctor's pretty much looked at me and said "I can't see why anything is wrong there is NOTHING there". Well now new symptoms have developed that I am not sure if are related. So I went BACK to the doctor and had blood work done all of which came up NEGATIVE!!!! I'm so lost....the pain is always there even without physical activity and the lump is easily felt with pressure which causes more pain. Here are my symptoms all of which may not be related.....:

-rib pain +lump

-swollen (only one on same side as rib lump) lymph nodes

-dizziness

-weight loss

-headache

-FATIGUE!

btw I have experiended NO trauma to my ribs it just showed up.

So anyone have ANY idea what this could be or what step I should take next??????????...PLEASE THANK YOU!!!!