Yes, I Am 50, Female Fighting Breast Camcer For Over

yes, i am 50, female fighting Breast camcer for over 3 years and diag MBC(spine) 1 1/2yrs, on faslodex and xgeva. Have had back left inside head pain and tingly/numbness for well over 2 years. this pain has increased quiet a bit over the past few days with today being the worst. Yesterday the whole left side of head and face throbbed and was numbly, tingly all down side of head and face on left side. The pain and dull hurting in jaw and cheek upper gums etc is almost unbearable. I had a reasonably good PET scan in spring, thats to say that no new issues or increase. But this is definately a problem and almost hate to see what tomorrow will bring pain wise. Its not a seering pain for like a deep jaw tooth ache, and i have dentures so tooth issues are unlikely. but the numb ache even affects my cheek skin on the left side. Can you give me any ideas as to what to look for in deciding or diagnosing and/or what might help. This is becoming so tensing and my neck is so tight from the fatigue and I always have excrutiating back pain esp since fracture/tumor RFA and vetebraplasty and herniated discs etc. Subsequently, I wear a sleeve for lymphedema and this may be unrelated but maybe but I am having some serious seering pain in my left wrist that takes my breath from time to time and there is NO relieving it until it does it for itself.