Dizziness, nausea, fatigue and severe headache?!

I had a hangover on Saturday but was fine all of yesterday and most of this morning. Then right before lunch I felt sick, thought it was hunger and so ate.

I've been clearing my room out and been feeling progressively worse all day. I took some paracetamol after lunch and drinking water, went out for some fresh air, but nothing is helping. I've had a nap for a while but woke up still feeling terrible.

Any idea what it could be? Surely can't still be side effects from drinking on Friday?

Thank you! :)