Help About Overcoming B12 Deficiency 😐

I (21M) have following symptoms past 3 years. Tiredness, Numbness in fingers, When doing something i feel like i am doing that in a dream , Short term memory loss (forget a thing in 30 seconds 😢), Can't focus continuously on something, Shortness of breath, I am speaking like a diplomat (can't speak normally. finding simple words), Sometimes chest pain when breath in, Eye blurriness suddenly (when i blink it goes off), Sleepiness all day, Always going something on my mind every time and which i can't stop like music.

I've done my highschool exams very difficult. I didn't told my parents about this.

Last 5 months ago I've consulted my family doctor and said everything to him. He didn't took any tests and prescribed B complex tablets (Neurotone) that has B1(100mg),B6(200mg),B12(200mcg). and i take that pill every day until today. Only i feel less numbness until now. And when i take that tablet i feel like shaking in my hands.

What can i do? Anyone have symptoms Luke me? Is this b12 deficiency issue? can i take b12 pills without taking b complex tablet that doctor gave? What happen if i only have b12 problem and i am taking b complex that has B1,B6,B12 ?

I am suffering without telling anybody for a long time please help