Msida, you could have used interior paint and had the same reaction. Some people just have that problem. When my children make out I am stupid, I point out that I taught them to wipe their backsides and to eat using cutlery! The arrogance of the young gets given back to them when they are old so I have a chuckle about that too.
My daughter reacts badly to new plaster, she almost goes into anaphylactic shock which was frightening the first time it happened.
As the others say, good ventilation and sitting in another room whilst the fume dissipate.
As we are on a decorating spree due to wanting to sell, I sympathise because it is so tedious. Nice when its finished but long winded and messy whilst doing it.