Stomach aches after swallowing??

So I️ recently started sucking my boyfriends dick and all my friends told me that “spitters are quitters” so of course I️ swallowed out of fear of him not thinking it was good or something. Ever since I️ first did i️t, he has asked me to do i️t every time we are together. At first I️ didn’t mind so I️ did but now it’s kind of getting annoying because i️t takes him longer each time because I️ am doing i️t so often. But long story short, whenever I️ swallow, I️ get a stomach ache a while after and it’s so bad to the point where I don’t even want to eat anything. Is this normal?