I need advise ,direction an advocate

       In October I started having Psychotic Thaughts after having had several physical syptoms of B12 Deficiency for a long long time the farthest back I can remember2002. I started taking Prevacid in 2002 and took it until 2006. After that I have taken Prilosec on and off right up to this previous September (2010). I have taken several trips to the ER in the last 9 years with shortness of breath and tingling in my arms and was always tested for heart problems. I was told there was nothing wrong that I was having a panic attack and just work my way through it. So for the last 5 years that is what I have been doing every time my leg has gone numb or the bottem of my feet tingle, I would tell myself it was stress or panic and just get through it. In August I started having shortness of breath and an overall feeling of weakness ( I could only take a few steps and have to rest. My Doctor suggested that I take Prevacid for the next 28 days since I also had a sharp pain in my lower right back. I took the prevacid for the 28 days and things have gone from bad to worse. Since finishing the prevacid in mid september here are my symptoms.....

Extreme Fatigue

Short of Breath

Ringing in Ears ( constant and Loud)

Sharp pain in shoulder blade on left side followed by numbness in left arm from elbow to back of hand

numbness on bottem of feet

     Then in mid October I had a terrifing symptom of psychotic thaughts, sounds hallucinations and was cippled with fear I really thaught I was losing it. After doing research on checking symptoms on web md one of the conditions that came up after I plugged in all my symptoms was B 12 deficiency. I again went to my doctor who reluctly tested me for b12 and folate. My b12 was on the low side at 350 folate was fine at 17. My doctor told me the b12 test was normal and could not cause any psychotic symptoms.  My symptoms have continued on and off and recently the psychotic symptoms have returned.

Can anyone suggest a path I should take Specialist I should see tests i should request. I am 80% convinced my symptoms are from b12 deficiency the other 20% im telling myself im nuts and should check into a psych hospital. please any and all info or comments will be appreciated