This is Dr. David
you need to see your GP doctor and get an ultrasound of your arm pit
you could have return of your seroma or fluid collection in your arm pit
you could have lymphedema in your arm as well which would need massage therapy, compression stocking, elevation of your arm to help decrease fluid build up in the arm.
some of your pain could be from neuropathy from nerve damage from prior surgery in the breast and arm pit.
sometimes nerve pain medications like neurotin (gabapentin) or lyrica (pregabalin) can help decrease nerve related pain in prior surgery areas.
let me know if you have other questions.
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