Usually when you have a blockage/or partial, you have some discomfort, from crampiness to severe pain. You are right though, sometimes it can start out feeling like the flu or that you ate something that didn't agree with your gut. Again, different people feel differently.
Dehydration is horrible. It will make you feel just like you have the flu. Nausea is vicious. You don't feel like putting anything in your mouth, but need to do that to rehydrate yourself. I hate it when I feel like that and try really, really hard to avoid that. It is really good that you figured that out on your own. You are really doing well and yes, old habits die hard.
Phantom feelings are real and will go away in time ... don't give this another thought. One day you'll just think - gosh, I haven't had that feeling in a while. Honestly.
You are doing well. And I love reading your posts. Good luck in school.
Diagnosed with CD in 1979, many resections and meds
Perm Ileostomy July 1984 at Cleveland Clinic
Disease free since surgery
Happy SILVER Anniversary to me!