Hi masma - I have Type 2 diabetes, which in no way compares with your problems, but last year I started to feel low and lacking energy. My diabetic nurse put me on a course of vitamin B12 injections, initially every 12 weeks and now every ten weeks.
I certainly feel better for it, but have no idea if it would help you with your symptoms, and the medication you're on.
Please go back to your doctor and let him/her know just how you feel.
And as Anngel said, 'Relax', but I suppose that's easier said than done. Best wishes.