Struggling with Fear and Panic Attacks After a Bad CBD Gummy Experience

I had a bad experience about 5 months ago, from what I thought was a CBD gummy, and it turned out to have a high amount of THC. I had the worst panic attack while high, and it triggered DP/DR. I've gotten much better with accepting it and allowing it to be here, but every now and then I have really intense episodes that remind me of when I was high and it's extremely hard to cope. I've formed this phobia about eating food I haven't prepared myself. I can buy a candy bar from the store and convince myself that someone put something in it when it was made. I'll challenge my thoughts by eating it anyway and then have a panic attack while waiting for the "drug" to kick in. Then I end up telling myself I'm not actually having a panic attack, it's a drug making me feel what I'm feeling. It's a terrible way of thinking, and I'm so tired of living in fear. I really need advice on how to stop my thought process and to stop being afraid of something I know won't happen. It doesn't help that I feel so disconnected from reality almost always. Please, I need some words of encouragement and reassurance that I'm not and won't go crazy.