Asalamu Alaykum Ustadh, What type of oath requires fasting? What if I broke that oath but I don't remember it? I tried to remember but don't even know if I've done it in my life Should I remain upon my certainity that I don't remember if I've broken any oaths because I'm doubting that I broke it?

Ustadh AbdulAziz al-Haqqan

Maybe I have misunderstood, but this doesn't sound like a question to me; it sounds like obsessive thoughts. Therefore, you have to be certain that you actually broke an oath, not just imagination and obsessive thoughts. Stay away from that.