I will randomly have trouble breathing and sometimes feel dizzy or a sharp chest pain whilst it happens, also the warm air makes it worse please help?

Yes. Are you generally anxious? Do these symptoms occur during activity like exercise? Do the chest pains occur when you take deep breaths? Although someone of your age typically doesn't have heart problems, your doctor should check an EKG to evaluate for any abnormalities (ie arrhythmias), also a test of your thyroid should be done. Hope this helps.