Lump above collar bone, pain for 2 days only. dr said it didnt feel like a lymph node and could barely feel it. xray clear but radiologist recomnended u/s so dr ordering one. scared i have cancer. why u/ s if xray clear and dr said not lymph node?

Any Trauma or Lab work performed ? I would look at a Bone Scan , no offense, since you are female and 40 y/o , for a better rule out on CA, if bone scan shows a hot spot, then further investigation is warrented.

First you need to be seen by your internist (NOT a GP) and depending on the findings of a complete evaluation, you may require referral for a biopsy or further testing. Unless you are a smoker, the probability that this is a malignant problem are relatively low. However, do not wait around hoping it will simply go away. Take care of this problem promptly.