idk about herbs, i know there are some out there. but you seem to have the same problem i did, in a sense.
i was taking acid reflux pills for not even a week, and i got all side effect short of a heart attack and stroke (and i read the side effects after so i wasn't mentally thinking they could happen before hand). so i had to get the toxins out of my system quickly and safely, and then you can begin on building blocks to get back on track in a safe manner. i've noticed that some herbs have a more laxitve effect and they're classifed as weight loss herbs, while effective they aren't always safe if you're not hyrdrating yourself properly.
what i did, was take Silenium and Vitamin E. Selnium is something you should have in your diet everyday, and you're supposed to get it in your food from the earth. it will not work properly without vitamin e-it won't hurt you, it just won't give you the desired results. then i took a epson salt and hydrogen peroxide bath. all the peroxide does and nutralize the water so if you're not comfortable with that then epson salt works just fine but nothing else can be in the water, no soaps or perfumes. i had to only bath once,but depending on how long you were on the meds you may have to take them longer.
What these do is bind and drain the chemicals from your body properly and in a safe manner. i feel more comfortable with supplements that we're supposed to have in our bodies already instead of herbs that could possibly react with the chemicals in your body (and normally i'm all for herbs but you just never know).
Once you are back to sqaure one and clean you can start introducing healthy things to your body again what worked for me is Alpha Lapoic Acid (in pill form) and Niacin (the no flush kind, never get slow release either).
Alpha Lapoic Acid balances everything in your body-from blood sugars, to blood pressure, your thyroid, whuch balances your hormones, which in turn helps you to lose weight safely. Niacin is something i take when i'm feel like i'm dragging a little, it's very much recomended for diabetes.
this combination also cured me of a pork allergy i had. now i can eat it no problem
This is just what i personally did, i am in no means a doctor, and this isn't for everyone. i've done my research however and i encourage you to do yours before you proceed, if you decide this method may be an option. i hope everything works out for you