My Mom (61) only remembers 5 mins ago. Where to go?

For the last 3 years we have battled with dr's. No clear diagnosis at this time. Our journey began 3 years ago after my Mom began to complain about numbness in her face with visual problems. MRI showed nothing. No stroke or any brain damage. During those 3 years my mother suffered with 11 bouts of pneumonia (which was not related) memory seemed to be fine during this time. Still no diagnosis for the numbness. About 7 months ago she really started going down hill. No balance.. we have to hold her hands to the bathroom etc. She began to get up in the middle of the night cooking (almost caught the house on fire) we took safety measures. Still going down hill. She doesn't remember what she had for lunch.. thinks she hasn't eaten in days. Days she sleeps all day other days she stays up 24 hrs. Took her to a neurologist who put her on Prozac. This only helped her with the emotions. Now she has no emotion except for anger . Dr. did blood work (showed low B-12) of which she stated "could be some of the problem" did 24hr urine test. (showed bacteria) which now she wants to send her to a blood dr. (not sure why) Took her off the prozac (after two months) because she's not sleeping and replaced it with something to help her sleep. Needless to say I'm very confused and tired. I work full time. My step-father is a alcoholic and that's a terrible mixture. She is on obama care so I'm sure that assisted living is not a option. Any advice would be appreciated