Concerns about meditation reactions

1. Why do I feel more tired?
2. Why do I feel more brain fog / sensitivity to noise after meditating sometimes?
3. Why do I feel tearful? 
4. Why do I feel restless? 
5. Arms and legs feel tingly, why?
6. Feel sick when come into body?
7. Felt like was floating rather than heavy, what does that mean? 
8. Have weird sensation of feeling sounds, what does that mean? 
9. Body temperature changes, what does that mean? 
10. Why do my arms often twitch when I do manage to meditate? 
11. Why do I yawn when meditating? 
12. Fall asleep straight away – feel more tired when do meditation practice?