Is this neurological?

[5daughters]

I have been experiencing pain, achiness. tingles, hot burning sensations, excrutiating pain in lower right leg,occasional vision problems, sharp out of the blue jolts,headache and sinus issues (left side),insomnia,constipation,urgent urination, heaviness in limbs, jaw pain. I feel fine for about a week and then my throat gets red, not sore, no fever, and then a few red dots. Then the fatigue, stiffness and weakness. Nights tend to be worse, mornings initially. It's hard to lift my legs up stairs and my grip is weakening. Lupis,RA, Peripheal neuropathy, Fibromyalgia ruled out. I had stage 3a breast cancer 2 years ago and have not felt good since. Went through the usual surgeries, chemo and radiation, was then started on tamoxifen. Started having severe side pain on right side, went off and they don't want to put me on anything till they can figure out what is wrong with me. Was also on Paxil at the same time as tamoxifen, and now they say paxil voided out the tamoxifen, so I guess know protection there. Anyway, the cancer doctors say I'm in remission and to move on. I developed lymphoedema due to lymph node removal so recovery was trying. whatever is ailing me no one can figure out. I'm tired of feeling so awful. Blood work through a rheumatologist showed my b-12 level at 235 and started me on 2500mcg of sublingal b-12 and folic acid. I also take Paxil40mg and lunesta and lorazapam as needed. Due to the contipation I take fiber suppliments daily. Please someone, can you tell me whats going on! I feel awful.