lifting induced stomach upset :(

sometimes when I go to the gym and lift weights my stomach will start to feel kinda light and funny, definitely off, borderline nausea. i can usually push through it, it occurs a lot of the time if i'm holding my breath and straining to do a lift without noticing. however, today this happened and after I drank my protein smoothie after the workout, my stomach has been feeling upset and unsettled all day. I've been hungry but i have no desire to eat, and this affects my ability to consume enough protein... but has anyone else experienced an upset/unsettled stomach after weight lifting, or know what a cause could be?

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