Hi, iv just spent over an hour and a half cleaning with pure bleach and now i have a tight chest, should i be worried?

Bleach fumes: may cause a bronchial tightening (Bronchospasm) or an asthma-like condition and chemical pneumonitis. I suggest seeing your primary doctor(or ER) ASAP so he can do a thorough exam and prescribe some inhalers, oxygen and steroids if appropriate. In the future, please use a respirator or a good-fit mask and avoid exposure to any fumes. Hope you feel better.