Hi - Unless you're having a problem with some of the filler ingredients in the BC pill I don't think the time of day you take them would make a difference. You might ask your ob/gyn about different types of pill formulations as some may be more likely to suit you and cause fewer side effects. That can take some experimentation.
You can contact the manufacturer of Fibercon and ask them how they set the maximum dose. There is really no such thing as an FDA guideline to a maximum daily fiber dose. They just recommend 25-35 grams per day minimum. For most fiber supplements you could take up to 25-35 grams per day as the dietary fiber you're getting on top of that is likely only 10 grams per day if you're an average American. In general, as long as you start at a low dose and increase gradually it's hard to take too much fiber without deliberately abusing a fiber supplement.
Ask the makers of Fibercon this question. They're the only ones who can give you a firm answer about their product.
How much of the fennel are you brewing in the coffee pot? It's meant to be used at about 1-2 tablespoons of fennel per cup of water, and you can have up to 6 cups a day without getting out of the realm of normal consumption. There are no known risks of fennel tea so it shouldn't do anything at all to hurt your body. Having said that, as with anything in the world, including just plain water, if you ingest far more of it than would normally be expected you can cause probems.
Best, Heather
-------------------- Heather is the Administrator of the IBS Message Boards. She is the author of Eating for IBS and The First Year: IBS, and the CEO of Heather's Tummy Care. Join her IBS Newsletter. Meet Heather on Facebook!