Loose Diarrhea for 5 weeks

Hey all, some things:

1) I've had loose bowel movements / diarrhea for about 5 weeks now. It started when I began an antibiotic for acne. Once I had diarrhea from it, I stopped taking it (I stopped taking it when visiting China). However, in China, the diarrhea continued. It's continued for about 5 weeks now (3 weeks after returning from China). Sometimes it's very watery, other times it's very fluffy and in loose little chunks (sorry for the gross description!). Before this, I've had pretty regular, normal bowel movements, so it's very unusual. Any ideas what it might be? Could it be a parasite?

2) Any reason my diarrhea would have chunks of food (vegetables) in it? I tend to eat a lot of veggies. Is this normal for diarrhea?

Hoping to head to the doctor this week, but figured I'd get some ideas here!

Thanks.

Get checked by your doctor as your symptoms have been going on for some time.
Generally, when you see undigested food in your stool, it means the food is going through your system to quickly. I get this sometimes. There are some foods that you will always see (eg. sweetcorn, peas) as they don't digest.
If you see your doc, they will take a sample to check for any infection/parasites.

If the sample is OK, try a good probiotic to get some good bacteria back into your gut.

I'm also certainly not constipated!