Breast pain back pain. Done is it safe?

Hi I have been suffering from upper back pian(just back of breasts)since aug it was less from Jan I am having severe pain along with left breast pain (few days 15 days like that every now n then and left shoulder blades at back side pain always I have severe ache in the upper back (back of chest)when I wake up in morning and stretch the chest Swollen under arm left side no lump found done physical examination by gynic she told no lump but asked to get usg Is it due to breast cancer or anything other I have done cbp crp lft lipid serum creatinine serum uric acid thyroid vit b12 all are normal esr 28 vit d3 15 on supplements Can I get usg done is it safe ? I have alrdy undergone 4 ct scans n 3 X-rays unnecessarily in past for other reasons Also many usg of abdomen during pregnancy and also from young age for pcos also in 2015 I have done breast usg So can I get usg done again or is it causes radu risk due to all these exposure as I heard it damages the tissues usg I mean