Hello, Thanks for the query to H.C M. C.
Flip flop of heart just for a few seconds with dizziness
and relieved after a short while after taking deep breath.
Here possibilities are of many reasons as
1 Due to anxiety
2 Due to hypo-tension ( decrease in B P )
3 Due to hyper-tension ( increase in B P)
4 Due to obesity as you mentioned.
5 Due to food which you took previous day
6 due to stress and strain.
7 Due to hypoglycemia
( lowering of blood glucose
8 Due to Hyperglycemia
Please consult a doctor and get your blood examination with X rays chest & ECG .
have a good day. Dr. HET