I think it sounds like you know what you need. Maybe tell them you're considering leaving your wife and children and job and the thoughts are coming constantly. Explain the symptoms and frequency. I think the signs that you're still in a mixed episode and could benefit from the help are there.

If you cannot get in consider posting here a few times a day and looking at some local support groups.

The Depression Bipolar Support Group has a database of local meetings and online support groups. Maybe check that out even if you cannot get into IOP.

DBSA - Depression and Bipolar Support Alliance