Hi welcome to HCM I have gone thru your query regarding difficulty in breathing and blurred vision during exercise . It is no doubt a matter of concérn . You should at once lie down and relax , Taking lemon juice in a glass of water , aspoon of sugar and pinch of salt and black pepper will give instant energy . When You are starting exercise all of a sudden without any warming up , you experience such unpleasent symptoms . There can be other factors also which cause such symptoms as , state of fevér ,lack of sleep ,lack of energy dehyderation, anemia etc., and lack of regular physical activity . IWould like to suggest you to get youself checked up thourougly by medical specialist and get treatment accordingly . Meanwhile ,take all essential nutrients in your diet including vitamins , minerals , fiber and antioxidants to boost your immunity which gaurds you against diseases . If you intend to do exercise ,You should do some warming up with consent of your doctor before starting wokouts , Avoiding food that is high in saturated or trans-fats like fried , fast foods , refined sugars and fine floor prducts , tea , coffee , alcohol , sleeplessness , dehyderation , constipation .worry ,stress all induce toxins in your body . It is advisale to consult your doctor before following any regime Hope this helps solves your query .Take care , All the best . Don t hesitate to get back if have any further query