Bipolar 11 patients are depressed most of the time, with an occasional upswing into hypomania (less intensity than mania) lasting as little an an hour up to a number of days. Bipolar 1 patients have have manias (more intense than hypomania) lasting as long as number of months.
Bipolar 11 patients tend to be ill for longer periods than type 1. Cyclothymia is a lesser form of bipolar. In cylcothymia, the depressions are not major depression as they are in type on and two, the depressions are periods of dysthymia (chronic depression but not as acute as major depression). No mania is present in cyclothymia but at least one hypomania must be.
Regarding hospital, you are very unlikely to get put in hospital. Even if you frequently feel agressive towards others and voice sucidal ideas, it is still unlikely you get put in hospital. Its quite difficult to get put in a hospital.
You need to be honest with you doctor abotu everything, otherwise you are denying yourself the the appropriate treatment. The intelligent decision is to be honest.