HI,
That is indeed concerning to have a
rapidRapid shallow breathing and sustained low such as what you described. If you did indeed hit a vein during injection, there is not much you can do once the injection is in(besides eating to keep your sugars up for the time being). Be sure to take some
mixedMixed respiratory vaccine foods too to help sustain the glucose levels: glucose tabs are good for the short term but the effect will run out, so take something else(like half a sandwich) as well as the tabs.
Try a different site and pinch a decent roll of skin, pull it out from your body. This may help avoid any veins.
Take care.