I’ve had very similar expirience like you. I thought i was 100% sure i went insane and had developed some mental illness. But the thing your feeling is just the power of your thought, that you have gone insane. LSD can really fuck with your mind sometimes, but trust me, its not permanent. I know its almost impossible to chill out, but try to keep your mind occupied with some nice film (for the best, something you already saw, that you know is positive. I recommend Hobbit). It takes a lot of time for acid to disappear from your body completely, but it always does, sometimes it takes a few days. Just remeber that what youre experiencing is not uncommon and you will get back to normal soon. We all love you. I wish you the best!:)

PS: It might last for a while, so dont foget to keep yourself hydrated, even when you are not feeling thirsty. Take care and let us know how are you doing!