Laughing at Islam waswas, need advice

[Aaqib]

Ever since an incident happened where I committed major kufr, I've been getting thoughts on everything and their becoming harmful to me.
Like, I remember the ruling on the relation between a mahram and a non-mahram in the middle of a joke, and then I was like "I messaged my female teacher". And now I'm suffering because I think I apostated.
And then I kinda giggled at "Last afternoon, Shaytan came and told you" because I thought of a little creature coming into a man's ear and whispering and now I don't know if I committed apostasy or not.

This is seriously becoming harmful to me.

[azc]

Don't worry, Allah swt is merciful if you've committed any severe blunder/sin, Repentance washes all the sin

[Serinity]

Repent, and don't ever turn to that - and remember why it happened, and never return to it.

Btw, I also have lots of kufr thoughts. :( Man it is hard at times. Best thing is to start to read more Qur'aan and remember Allah :swt: more.

Allahu alam.

[Aaqib]

Yes but I don't want to keep repeating this "sin" (I don't know if I'm actually sinning by doing what I've mentioned)