Hi LABA and welcome!
I have had the same experience shortly after eating. I was suffering acute anxiety...though preceding the episodes was not necessarily feeling anxious at that moment in time.
I did not present with an organic gastro issue, but had significant stomach symptoms including pain, and the faint feelings you described.
I too recommend working with your doctor to differentiate between what is a physical issue (if any) and what can be attributed to anxiety.
Working to manage
both the issues (stomach and anxiety)...as a two pronged treatment plan, should find you feeling much better all around.
See our Resources for self-help daily maintenance ideas...and keep posting if you find it helpful. Support and understanding is key!
https://www.healingwell.com/community/default.aspx?f=9&m=104206