OK, I'll take a stab at three of them:
Q My symptoms don't seem as bad as others, are there different levels of severity?
A

Yes. For example, in the case of diarrhea, some may have 1-2 soft stools per day, while others may have up to 25 explosive, watery stools.
Q What is the difference between MC and IBS or IBD?
A

IBD means "Inflammatory Bowel Disease" and includes ulcerative colitis, Crohn's disease, and MC. With IBDs, there are findings of actual disease on medical tests. IBS stands for "Irritable Bowel Syndrome", which is NOT an IBD and does NOT have any positive medical findings.
Q I have been diagnosed with MC, do I need a second opinion?
A

No, not if the diagnosis was made by looking at biopsy specimens of your colon under the microscope.
Polly
Blessed are they who can laugh at themselves, for they shall never cease to be amused.