Hi welcome to HCM I have gone thru your query regarding shivering and dizziness after exercise and can understand your anxiety . Dear ,I feel you are over exerting which body is not able to tolerate and result is feeling of shivering and dizziness , I would like to suggest you to sit /lie down cofortaly with closed eyes . Take lemon juice in a glass of water sip by sip and relax . It is an instant energiser. There should be some cause behind your suffering Once the cause is found and removed ,your anxiety will be over . Some of the causes : 1. When you abruptly stop ardous physical activity , the heart slows down its pumping activity, decreasing blood circulation ,you feel dizzy or even faint. Coming to a full stop only after gradually decreasing activity can help by maintaining heart rate and circulation and only gradually reducing them. Jogging slowly at first before dropping down to a brisk walking pace could do the trick . 2. Maintaining good nutrition is also important if one is a vigorous exerciser. but as you claim that you eat complex carbohydrates through out the day, i sleep well , so far it is ok . Possibally your intake of essential nutrients is not suffcient as much as your body requires ,you have to take care . Include Fiberous & calcium-rich foods like yogurt , cheese and greens -a balanced diet containing all essential nutrients - fiber ,vitamins ,minerals fresh fruit , veges and antioxidants - Olives, Aloe vera , ginger , garlic , help alley inflammation & pains . 3.lack of hyderation can also cauše dizziness , 4 . lack of sleep ,are the few causes which can trouble you . To strengthen your immunity Do Yoga ,Pranayam ,Deep breathing - Inhale as deep as possible - Hold - Exhale -Hold - help to re-expand lungs help detoxing the inner system and boosting the energy by providing sufficient oxygen . Do Practice under trained guide. It s important to make an appointment with your health doctor for a check-up and consultation. Hope this helps solves your query .Take care , All the best . Don t hesitate to get back if have any further query