Need some advice, please help
Assalamualaikum. I suddenly remembered something from last year and the guilt is tearing me up right now. I'm really ashamed to even bring it up. To keep it short: me and some friends went out and I got into a heated argument with someone. I can't even fully remember why I said the things I did, but they were wrong and I truly regret them. To make matters worse, the boys recorded it and were joking about putting it on their status. I don't know if they actually did, but the thought that others might have heard me speak like that makes my skin crawl and brings me to tears. I repented as soon as I got home after I realized what I had done, but they might still have that video of me. I'm terrified about how this will affect me in the akhirah. Sometimes I'll be fine and then out of nowhere I'll recall that moment, especially when my iman feels low or while I'm trying to make dua. On top of that, my iman has been really low recently. Alhamdulillah I pray at school so I don't miss my prayers, but I still don't feel peace. My mind drifts during salah and I struggle to concentrate on the words. I'm grateful to Allah for the guidance and for how far I've come, Alhamdulillah, but there are days I just don't feel like praying or doing dhikr. If anyone has advice - simple tips for calming guilt, strengthening concentration in prayer, or ways to increase iman - please share. InshaAllah I'll try to implement your suggestions with Allah's help.