I’ve been in this situation myself. As hard as it may be for you to accept, this problem will go away with time.

Let those thoughts go. If they come of themselves, let them go still. Don’t try so hard to fight and banish them, or feel guilty for having them. If they come, just experience them, without getting attached, and they will go away.

Try to find something new to do that will make you happy, and focus on it.

I hope you will feel better soon.