Are words said inadvertently and without the intention of reconciliation, which included "I bear witness before Allah, O so-and-so, that I have taken you back," considered a reconciliation, and does a divorce uttered with the intention of convincing the wife that the first divorce has occurred take effect, knowing that I suffer from obsessive thoughts about divorce?

Your conversation with your wife to convince her that the first divorce occurred does not result in a second divorce, and doubt is not taken into account. You then reconciled with your wife and had witnesses to your return, so only one divorce is counted against you. You must ignore these whisperings (waswas) and beware of excessive questions and elaborations that increase thewaswas and muddle the mind.