OMG AM I FUCKED UP??

My first ever time inhaling n2o recreationally was from an exotic whip canister, 2 days ago where i took 7 balloons, some small but at least 3 were quite big. Today like a fucking dumbass i decided to inhale again. I probably did around 15-17 ballons before the canister was empty (I shared the canister with a friend, who'd also never taken nitrous before) and most were middle-sized, a few big. My first exposure today was in the afternoon around 4pm, maybe 8 balloons. The last exposure was 2 hours ago after i did maybe 10 balloons.

Now I am at home, panicking because i feel a slight numbness in my right foot and also my fingers are clammy from sweat because of panicking, but when I type, I feel like they are ever so slightly different-feeling than usual. About b12 supplementing- bought a tub of 1000 microgram tablets the day after my first exposure and took 2 tablets, today I took 2 tablets in the morning before any exposure and a few minutes ago, 1 hour and maybe 40 minutes after the last balloon I took 2 more.

I know that I killed the b12, but I am panicking hard I don't want to get so much nerve damage. I am never doing this shity novelty substance again. Am I fucked forever????