What are the reasons for dizziness, brain fog, and migraine following B12 shots for panic disorder?

Hello doctor,

First, let me start by saying that I was diagnosed with panic disorder 10 years back. I do not think this is an anxiety or depression problem. Seven weeks back, I started getting B12 injections. The first shot took five days to start working but once it did, 90 % of my anxiety went away. This was naturally life-changing for me. I have not missed my B12 shots except once when the person who gave the shots was out of town. I have had six B12 shots in total and I took my last shot four days back. I am now experiencing (and have been experiencing even before my last shot) dizziness and brain fog. These are two things that I associate with having anxiety, and I can feel that the anxiety is gone, but my body being in this type of state is making me feel worried.

But I will not panic, and I shall focus on finding a solution. The other problem that may be contributing to my anxiety is migraine. Eight days back, I got a migraine that lasted for three days (with reduced headache in between). I have been known to have migraines without headache before and last night I decided to take Imitrex before bed in case this was a silent migraine. I woke up in the middle of the night with a pounding head and I took another tablet of Imitrex. This morning I woke up and my headache was gone but I still felt dizzy and had brain fog.

Also, last night, I experienced restless legs and for the past one week, I have had a dry mouth. Sometimes, I experience breathing issues. I am not sure if I have some MTHFR gene mutation (getting tested is very difficult to find) whether taking the B12 shots without taking Folinic acid put me into this situation or if it is a migraine problem. I am unsure whether I have some other type of ongoing deficiency (potassium) or have a B12 overdose. I would like to note that a week after my first B12 shot, my blood levels came back to a range of 500 pg/mL.

So, I do not know if I had only a B12 deficiency that helped me cure my anxiety. I am not sure if I should try taking Folinic acid to see if that helps or if I should take potassium or if I should concentrate on migraine (which I honestly cannot tell if it is present or not). I cannot get the blood tests and genetic testing done immediately since my doctor is out of town. I need help with this now since the longer it persists the more, I feel like how I was when I had anxiety previously and I do not want to experience the same again. I took my shot of Depo last week and I regularly take Ibuprofen for headaches and muscle aches. Please help.