Welcome to healthcare Magic!
You should not take any unauthorised products, because we do not know the exact content of the drug the best way is to avoid taking it any more.
If you have taken it within 1hr then you can induce vomiting
by taking warm mustard oil 10ml or or warm saline a bit hard solution 50ml stat.
you did right thing by taking bananas.
You should take more bananas and if you have access then take 20grams of Charcoal
stat. so that it will absorb the poison.
If you think you are getting sicker then report to nearest ER to get a gastric lavage and supportive treatment.
Wish you a great health!