This is a very common problem seen in runners. The low abdomen pressure that you feel is basically the muscle cramps
due to vigorous breathing during exercise to supply adequate oxygen
to the muscles. If i was your doctor i will recommend u to massage
the abdominal muscles to alleviate the pain and slow down a bit when the pain starts. Also u will adapt to it if u continue to jog with time.
As far as your nausea
is concerned it is because of the severe dehydration
that u get while jogging. As u live in a high temperature and humidity zone it is very easy to get dehydrated while jogging. If i was your doctor i will recommend you to drink every 15 to 20 minutes and keep yourself hydrated.