It could be that you were hungry and then because of that you shook and got worried about it and the worry has kept on making you shake. It also depends how much you've eaten and what sort of food it is. As well as that, how long ago you've eaten it, it can take a while for the energy from it to pass into your bloodstream (and the timing depends what you've eaten). Try and sit down ,calm yourself down taking deep slow breaths and have a drink.
Have you done anything which may have required lots of energy such as exercise or have you been purging or something? Those can both cause you to shake a bit especially because of your low BMI. Do you have any other symptoms apart from the shakiness? Have you started any new meds in the last couple of days? Have you been shaky all day or just for a while/ how long?
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