heart palpitations 😰

So I woke up this Morning and my heart is palpitating and I was shaky. The shakiness went away but my palpating has not, and this started around 11:30am and it is now 3pm. Idk what this could be but I'm getting really anxious. I mean a few important side notes for input: I got the flu shot in October (but I know the flu is going around), I worked out last night (running 4mi which I have just started doing again, though that's the most I've ran in a workout in a long time), I don't have a fever, and I had a lot of sugar yesterday. Input please?!