Doubts about kufr

Salaam I am someone who is very scared about committing kufr/shirk. Sometimes i think I have done so but can't remember either what exactly I said/did, the intention behind such an action, or whether such an action constituted shirk/kufr. Theoretically, if I have committed kufr but not completely sure, and I ignore it so I don't spiral (because I have had bad OCD episodes in the past), would I be excused? I want to look for marriage sometime in the near future, but only once this issue is behind me since I don't want to for example, think I have committed kufr and then believe I need to renew my nikkah. Could you please give me an encompassing answer to deal with this. JazakAllah