Negative Thoughts

Hi everyone, my name is Neela and I'm new here. I suggest you don't read this with a weak heart or mind, because I think it can be triggering for some.

Sometime ago I had a panic attack that lead me to think negatively like "Is this life worth it or not." Things look bleak and just not interesting enough to give effort into anymore. I don't have any problems in my life except my trouble of breathing or anxiety that just came out of nowhere, that condition made me mentally and physically tired and emotionally numb. I used to be a very positive and happy person, until this condition hit me.

Now I'm recovering from this and I already clear up the clouds that cover my life and find the purpose of it. I live my life because I love my life, I am not leaving this life I love. I want to live this life till I physically cannot.

But sometimes negative thoughts just crossed my mind suddenly out of nowhere, even when I'm doing something else entirely not connected to the negative thoughts. It's like an ad that pop up out of nowhere in the middle of youtube videos, and I cannot skip it??? Is it normal for it just to came back out of nowhere sometime from time to time? Will I ever be totally free from it? It's like I shown this negative thoughts myself once before, and now when I left, they're the one chasing me.

Can anybody please give me some advice on how to recover from this effectively?

Thank you so much, I hope we all can get better soon <3