What are the symptoms of vitamin D deficiency?

Hi doctor,

My symptoms over the last four months are as follows. I sat down on my mother's bed and could not get up. I had severe pain in my lower back on the left side, shooting down my leg. They felt like electric shocks, and it lasted for a little over a week. During that time, I had a lot of memory issues, and I forgot my son's birthday, too. Three months back, I had an episode of double vision. Vision was double out of my right eye, but when I covered my left eye, I could see. During this period, my head felt heavy. It only lasted for about five minutes and then corrected itself. The next day, my eye was very sore. It started to hurt when I looked from side to side. I had a lot of flashing lights in my left eye that looked like shooting stars on and off throughout the day. I just did not feel very good. I am having trouble finishing sentences. The thought just goes away, and I forget what I am saying. The next day, when I had laid down to rest, I realized my left arm felt weird. It was numb and tingling from the shoulder down. I thought I would just take a nap and see if it got any better. I woke up at 5; still, it was numb and tingling. Took a hot bath and got out, but it remained the same. It felt as if I had rubbed icy hot all over it. It felt very cold to me, but not to touch. By the time I reached the emergency room (ER), I was having trouble talking. I could not get my words from my head to my mouth. It was like they were getting stuck. I had a computed tomography (CT) scan done, and all laboratory tests were normal. The ER doctor recommended seeing a neurologist. I got an injection of Solu-Medrol. Immediately, the following day, I was stuttering, and even my thoughts were stuttering; the more I tried not to, the worse it got. Both hands started tingling, and there was tingling in the left leg from the knee down. At night, while I was lying on the couch, I had excruciating pain on the left side of my face. My entire cheek felt like it was going to explode off my face. I took 800 mg Motrin. The pain lasted for about 45 minutes and just stopped. It did not gradually go away; it just stopped. Then the next day, I still felt off and very shaky. I felt it was hard to even type or text. I cannot focus on my thoughts. I had a very fuzzy head along with stuttering. My hands, feet, arms and legs are still tingling on and off. I have started feeling my scalp tingle as well. The following day, I had very shaky hands. My hands hurt and felt weak. It felt like I had been holding onto something really tight and just let go. Still do not feel right. Glasses were not helping. My eye still hurts, and I'm still seeing flashes of light. The next day, I drank a very small amount of wine that was not even a full glass. My hands felt like they had been hit with a hammer, and my scalp tingled so badly that it made my eyes squint and gave me a horrible feeling. I have no energy. I feel so tired and could not even cook supper. My arm was too weak to brown hamburger meat. My head feels very strange, like someone is pushing on the right side of my temple. It is all still pretty much the same the following week. My scalp is tingling, I am still stuttering, and I have a lot of weakness in my hands and arms. My left leg has started giving out on me, and I had a fall in my living room. Blacked out when I stood up. I am still seeing flashes of light. Not sure what night this was, but one night when I went to bed, it was like my body had the hiccups, and my arms and legs just kept jerking. I woke up feeling really bad. Head hurts, eyes hurt, and hands and legs are still tingling. Still stuttering, sometimes mid-day, I noticed my thoughts were no longer stuttering. The stuttering was gone. And slowly that day, I started to feel better. No more tingling scalp, hands or feet. For the most part, this is how it has been since. Thanksgiving, I had a very small amount of wine again (not even a glass) and felt horrible again. Scalp tingling, body hurt, and even fell into the wall. Other than a few little tingles here and there, the symptoms have stopped. No more flashes in the eyes and no pain other than headaches. I am having some strange red and purple feet and hands. My hands hurt when they get cold. Feet and hands turn purple in the bath. Normal magnetic resonance imaging (MRI) with contrast. What should be the next step?

Kindly guide.