Either your timing is off or your material is very impure.
500mg harmalas has the potential to make one very dizzy, sick, & sensitive to light on its own & also have psychedellic effects.
1g dmt activated by 500mg harmalas is beyond anything you ever want to experience i promise you that.
If you'd gotten full effect you'd most likely be posting a very fearful & disturbed report of what happened & trying to piece the memmory of the trip together.
If you do it right, 200-250mg harmalas & 50-75mg dmt will provide a fully immersive experience that comes in waves for a few hours.
You'll literally lose all contact with reality & come back repeatedly.
If your acrb is good quality & brewed right, 20g is insane & if you dose like that with low quality material & don't get your maoi dosage dialed in, you'll think that is a normal dose until you encounter some potent root bark & correctly timed & dosed maoi & then you'll be in for trouble.
Please consider doing ALOT more reading before dosing again.
Get your harmala dosage dialed in & get a feel for the effects as well.
your materials will go much further when you knkw exactly how much harmalas you need to activate dmt, smaller amounts of dmt can be used with propper inhibition & they will work much better.