Welcome @kakiqueen
What you're suffering from is carb flu.
First thing to say is that it willI pass! Second, though, I'd suggests that you up your carbs a little - that should help with the palpitations.
You need to sort your electrolytes out - sodium, magnesium and potassium.
Sodium is especially important - so cook with salt and add it to your food. Have a hot drink made from Oxo, Bovril or Marmite.
For the others, key foods are salmon, spinach, avocado and full fat natural (Greek) yoghurt. You might also want to try a supplement - the one I usually suggest is Zero, made by High 5 - you can get it from the High 5 website, or from Holland & Barrett, Evans Cycles, Halfords and (probably) Amazon.
Don't give up!