What could be the reason that i am allergic to green vegetables and spices?

Unlikely: It is highly unlikely you are allergic to all green vegetables & spices. You may be allergic to specific ones but not generally all. If your reaction to spices is heartburn or stomach upset, that is not an allergy. Same for veggies. An allergy is a very specific reaction in your blood that presents specific ways to specific proteins - e.g. can't breathe, rash. Sounds like you're sensitive to them.