Lots look like undigested food but some could be pieces of flukes. I suggest not eating any mushrooms while you try to find out what you have. H pylori causes the stomach acid to go very low hence the undigested food. You need to try mastic gum as i have heard good reviews on eliminating it. You can also try juicing or only puree diet for about a week and see if you still get these pieces. I suspect fixing your h pylori issue will help your stomach acid to get better. Funguses also cause low stomach acid so you might want to add coconut oil and caprylic acid, turkey tail mushrooms to your regimen. Cloves and other strong especially bitter herbs i would avoid if i were you, these are toxic and just make things worse. You can use a teaspoon of papain powder in some pure unsweetened cranberry juice morning and evening instead. Turmeric is also good to help increase digestive juices, as well as fresh ginger (juiced or grated and cooked).