I had not slept the night and only got about 30 minutes before fajr. My mind was clouded with sleepiness as I was doing dhikr,eveytime I uttered the part "None has the right to be worshipped except Allah, alone" I got thoughts of different things such as Shaitan, dajjal and negative thoughts ( don't know how to describe them).I read the dua Amantu-billahi wa rasulihi, read auoothubillahi, and thought of Allah's names while reading the meaning. I want to believe they are intrusive thoughts but I fear I have committed major shirk as if I was associating and it's disturbing me greatly! I have said the shahada a lot of times. Please advise.