Artificial Emotion, I'm going to echo what's already been said: Subway sandwiches are not giving you the fiber you need. It's fine to eat meat but try to incorporate veggies and fruits every day. I like Wendy's salads and take them home mixed with my own romaine and spinach. Broccoli, carrots and cauliflower are tasty with some yogurt or creamy dressing and fill you up nicely. Same with baked potatoes.
I had a yoga instructor tell me if you're not having two bowel movements a day, you're constipated. My GI doctor did not agree with that assessment. For the mess left over from bowel movements, unscented baby wipes have been a big help to me. I've had IBS for years and found that certain medications seem to amp it up.
Specified, don't ball up the bathroom tissue- that's wasteful. Instead, fold it over a few times and you won't need to use so much.