Having constant abusive thoughts about Allah

Assalam u alikum, I am facing a problem from several days. I get bad thoughts (actually abuses) about ALLAH in my mind and I feel very depressed after having such thoughts. I also cry and repent, say Shahadah, and scorn myself, and pray to ALLAH. These thoughts keep constantly coming to my mind whenever I pray salah and also in other times. Earlier these thoughts used to come only in salah, but now they come all the time. I am also not sure whether I say these bad words in mind or did I utter it slowly because I have a habit of saying things to myself. I don't know how to deal with these thoughts. Would I be accountable for these thoughts? The thoughts are very bad, that is, they are clear abuses. That's why I am sending you this problem so that I can get help regarding this. Please provide me a detailed answer whether I am accountable for these thoughts or not and if I am accountable then how should I repent for it. I hope you will answer me soon because my anxiety is increasing day by day.