Please don't view this as a sanity issue. I am mildly bi-polar and take anti-anxiety meds. I am also prone to depression but I've always had horrible side effects from anti-depressants and I don't take them. I've also been in and out of therapy for about 20 years.

You are right about the fact that most people have very noticeable mood swings. But I am however, perfectly sane as are you and almost everyone here. We just need help via medication and therapy to try and control the severity of whatever disorder we may have.