Hi Chanel, sorry to hear you've experienced ongoing issues since your surgery.
I had a lumpectomy & sentinel node biopsy in July 2015 & still experience soreness & a weird tightness in my armpit lymph glands when I'm cold or nervous due to the sentinel node excision.
I've also recently had a re-excision on my other breast (following a lumpectomy for a new primary tumour) ) & am experiencing much more breast soreness & tenderness than the previous 2 surgeries. Surgeon said may take 6-12mths to heal.
Keep mentioning it at your follow up checks or next time you see your GP so the time frame gets noted on your file for future reference.
Mel xx