B12 shot

I need advice….. I took a methylcobalamin b12 shot on Tuesday and ever since then I’ve had a tight chest, almost like I’m having anxiety/panic attack. Every time I take this shot I feel terrible the rest of the day but it subsides after a day.

The tightness has dissipated since Tuesday but it’s still there and it’s kind of concerning. Would anxiety or side effects from the shot last this long or should I go to the drs?

I’ve had to take Xanax every night and it’s making me go to sleep but not taking away the tightness in my chest.

B12 (Methyl cobalamin) Injections – Inject 1ml Intramuscularly weekly

This was prescribed by my dr